10 Best Smart Smoke Detectors

Smart smoke detectors: what matters

The strongest starting point is verification of the exact product model, not just the manufacturer or product family. Look for a current third-party U.S. listing to UL 217 for residential smoke alarms and, when carbon monoxide is claimed, UL 2034 for residential CO alarms. A registry entry should match the model number and the physical product label. Relevant records include UL Solutions Product iQ and Intertek's ETL Listed Product Directory; an OSHA Nationally Recognized Testing Laboratory listing explains why the testing organization is recognized, but is not by itself proof that a particular alarm is listed. The installation manual and back label should agree with the online listing.

UL 217 edition and test scope also matter. Newer requirements include more demanding fire scenarios and cooking-nuisance testing. That does not mean an alarm will never sound during cooking, and certification is not the same as an independent, product-specific ranking of fire response or nuisance resistance. Buyers should still follow the placement instructions, especially around cooking appliances, bathrooms, garages, fuel-burning equipment, and high-airflow locations.

Separate the alarm's core function from its headline smart features. A claim such as “smart,” “app enabled,” “real-time alerts,” or “interconnected” may mean phone notifications, local radio linking, wired alarm-to-alarm signaling, or merely compatibility with a gateway. Check whether linked alarms still sound without Wi-Fi, internet, cloud service, a hub, or a phone. App notifications should be treated as supplemental. Also check whether a carbon monoxide-only product is being presented near smoke alarms in a way that could imply broader protection, and whether a smoke-only product is being mistaken for a combination alarm.

Numbers can mislead when their conditions are omitted. An 85 dB rating is normally tied to a stated distance, such as 10 feet or 3 meters, and does not guarantee that every occupant will hear it through walls or while asleep. “Ten-year battery” may refer to expected battery life, sensor life, or the complete alarm's service life; some supplied products use replaceable batteries while others require replacing the entire sealed alarm. A displayed CO reading, indoor-air-quality feature, or low-level alert is not automatically a certified life-safety function. A product's internal comparison or manufacturer claim is not an independent test result.

Recurring cautions in the supplied reviews are important. Several products are not hardwired and cannot activate every alarm in the home; others require compatible wiring or a particular interconnect family. Several have conflicting app, Wi-Fi, interconnection, battery-life, or UL-edition claims. Exact current listing confirmation was unavailable for multiple products, and physical labels or production dates may matter when older and newer standards coexist. Sealed lithium alarms become electronic and battery waste at end of life, while replaceable batteries require ongoing maintenance. No supplied product should be treated as a substitute for following local requirements, the installation manual, regular testing, timely battery replacement, or a separate alarm when its stated scope does not cover the hazard.

Integrity

Full reviews

#1 - Best Overall

Wireless Smoke and CO Detector, SC06-W

Buyer Score 99/100Integrity Score 78/100X-Sense

Overview

This product is a six-unit, battery-powered residential smoke and carbon monoxide alarm set. Each round alarm combines a photoelectric smoke sensor, an electrochemical carbon monoxide sensor, a sealed lithium battery, a test and hush button, and local audible and visual alerts. Units are installed on a wall or ceiling and communicate directly by radio, rather than requiring household Wi-Fi or a hub for primary interconnection. Intertek’s public directory independently lists the exact product family for UL 2034 carbon monoxide detection. X-Sense states that the smoke function is ETL certified to UL 217 and that the device uses a 10-year sealed battery. Its current product page says a network supports up to 18 units, while the installation manual attached to the marketplace listing says 24. That discrepancy, plus an unclear “smart app” claim, makes it important to follow the included manual and the unit’s back label.

What works

• Intertek independently lists the exact product family for UL 2034 carbon monoxide protection.
• Direct radio interconnection keeps the primary whole-home alarm function independent of Wi-Fi, cloud service, and a phone.
• The manufacturer specifies a photoelectric smoke sensor and electrochemical CO sensor, with distinct smoke and CO alarm patterns.
• The stated 10-year sealed lithium power supply avoids annual battery replacement under its specified operating conditions.

What does not

• Public verification located for this exact product family confirms UL 2034 CO listing, but a current public Intertek smoke-listing record for the exact wireless version was not located in this review.
• The manufacturer’s current page says up to 18 interconnected units, while the marketplace manual says 24. Network planning should use the documentation supplied with the units.
• This is not a hardwired alarm, so it is not a direct replacement where local code, an inspector, or an existing system requires AC-powered interconnected alarms.
• The sealed battery cannot be replaced. The entire alarm must be replaced at its stated 10-year service end, creating electronic and lithium-battery waste.

Who is it for

This set suits a homeowner or landlord who needs several battery-operated combination alarms across a small or medium residence and cannot readily add interconnect wiring. It is particularly relevant where whole-home audible warning is wanted without depending on Wi-Fi, a subscription, or phone access. The radio network can extend an alarm signal from the initiating unit to compatible units elsewhere in the home. Installation still needs to follow the placement diagram and local requirements, especially around sleeping areas, fuel-burning equipment, and kitchens.

Who is it not for

It is not suited to homes that must retain or install hardwired alarms under local building rules, insurance requirements, or an electrician’s plan. It also is not ideal for buyers who require verified voice evacuation instructions, room-specific spoken messages, or independently documented app-security support. Households with frequent cooking-smoke alarms should be especially careful about placement. Modern UL 217 tests address a cooking nuisance scenario, but NIST research shows that even newer alarms can still sound during real cooking activities.

Integrity

The most important health finding is the independently confirmed UL 2034 carbon monoxide listing for the exact product family. The manufacturer also documents photoelectric smoke sensing, electrochemical CO sensing, at least 85 dB local sound at 10 feet, separate alarm patterns, fault indication, and a 10-year replacement point. The primary radio interconnection is a practical resilience feature because local and linked alarms do not depend on household internet service. No CPSC recall or safety warning specific to this product was located in the review. However, the documentation is not fully consistent about its interconnection limit and smart-app scope. Environmentally, the sealed lithium battery can reduce routine disposable battery use over the stated service life, but it also means each unit becomes electronics waste at replacement. The reviewed materials did not provide product-specific U.S. recycling instructions for the alarm and embedded batteries.

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#2 - Hot Deal

Kidde Smart Smoke and CO Detector

Buyer Score 96/100Integrity Score 88/100Kidde

Overview

This is a ceiling or wall mounted residential combination smoke and carbon monoxide alarm. It requires 120V AC wiring, uses two replaceable AA batteries for backup, and connects to a 2.4 GHz Wi-Fi network for Kidde app notifications. Its smoke sensor is photoelectric and its carbon monoxide sensor is electrochemical. The product is intended for homes, not boats, RVs, commercial, or industrial settings. Its core life-safety functions are independently supported. An Intertek authorization issued January 15, 2026 lists this exact product under UL 217, 10th edition for smoke alarms and UL 2034, 5th edition for residential carbon monoxide alarms. Kidde specifies an 85 dB local alarm, distinct voice messages for fire and carbon monoxide, AC-wired interconnection, and a 10-year replacement interval. Wi-Fi alerts are explicitly supplementary and depend on AC power, home Wi-Fi, internet, and the app.

What works

• The exact product is covered by a current Intertek authorization for UL 217 smoke and UL 2034 carbon monoxide requirements.
• Hardwired interconnection makes compatible alarms sound together without relying on Wi-Fi or a cloud service.
• The local warning is manufacturer-specified at 85 dB at 10 feet, with distinct fire and carbon monoxide voice messages.
• Two AA backup batteries maintain specified alarm operation during a power outage, provided they are installed and maintained.
• The manual provides distinct low-battery, sensor-fault, carbon monoxide-fault, and end-of-life signals, plus a stated 10-year replacement point.

What does not

• The smoke function is photoelectric only. The manufacturer does not claim a second ionization smoke sensor in this product.
• The voice alert names the hazard but does not provide a room or device location in an interconnected system.
• App alerts, remote testing, and app controls are not primary life-safety monitoring. They stop working without AC power and depend on Wi-Fi and internet connectivity.
• Kidde's faster detection and greater precision figures are based on its internal comparison testing, not a published independent test of this exact product.
• The unit uses replaceable disposable AA batteries and the manual directs replacement and disposal, but does not provide detailed electronics or battery recycling instructions.

Who is it for

This product suits a homeowner or property manager replacing an existing compatible hardwired residential alarm system who needs combined smoke and carbon monoxide detection at that location. It is especially relevant where local, interconnected alarms are the primary warning method and app notifications are an added convenience for low-battery, contact-lost, or alarm messages. Installation requires a suitable 120V alarm circuit and correct interconnect wiring. Buyers should be prepared to test it weekly, replace the AA batteries at least yearly, and replace the complete alarm after 10 years.

Who is it not for

It is not for a home without compatible hardwired alarm wiring, or for a buyer seeking a battery-only smart alarm. It is also unsuitable for RVs, boats, commercial or industrial spaces, or anyone who expects Wi-Fi notifications to substitute for monitored fire protection. Households that need alarm messages identifying a specific room should note that this product identifies fire or carbon monoxide but does not state a location through its voice warning. It also requires ongoing attention to replaceable AA backup batteries.

Integrity

The main health-strength finding is the exact product's current third-party Intertek authorization for UL 217, 10th edition smoke alarm requirements and UL 2034, 5th edition residential carbon monoxide alarm requirements. That supports both advertised hazards, rather than treating app connectivity or a general brand claim as evidence of protection. The manual also makes an appropriate limitation clear, mobile alerts are supplementary and Wi-Fi features do not operate without AC power. No recall specific to this product was identified in the CPSC recall material reviewed. Older Kidde alarm recalls exist, including the 2021 TruSense recall, but those notices name different model series. The product has a 10-year limited warranty and warns users to replace it at its end of life. Its sealed electronics are not repairable, and annual AA replacement creates recurring battery waste. The instructions do not give detailed recycling directions, so users should use local electronics recycling and appropriate battery collection programs rather than household disposal where those options are available.

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#3

X-Sense Smoke and Carbon Monoxide Detector Combo

Buyer Score 92/100Integrity Score 82/100X-Sense

Overview

This three-unit set is a ceiling or wall mounted, battery-only combination alarm for residential smoke and carbon monoxide detection. Each round unit measures about 5.7 inches across and uses a photoelectric smoke sensor, an electrochemical CO sensor, a test and silence button, status LEDs, and an LCD that displays CO readings and battery status. It is designed to operate as a standalone local alarm, not as a hardwired household system. The most important verification is that Intertek's current ETL directory names SC01 among battery-operated photoelectric smoke and CO alarms listed to UL 2034. X-Sense also states that the current SC01 meets UL 217 9th Edition, has a sealed lithium battery for about 10 years, and sounds at least 85 dB at 3 m. However, the product record does not provide a back-label or manufacture date, which matters because X-Sense says earlier U.S. units were made to the older UL 217 6th Edition standard.

What works

• Intertek's ETL directory specifically names SC01 in its listing for residential carbon monoxide alarms to UL 2034.
• The product combines photoelectric smoke sensing and electrochemical CO sensing in each unit, rather than treating CO as an app-only feature.
• A local audible alarm rated at least 85 dB at 3 m and visible indicators work without a phone, Wi-Fi, cloud service, or hub.
• X-Sense states that the sealed lithium battery, automatic self-checking, low-battery warning, fault indication, and end-of-life warning are built in.

What does not

• This standalone model does not provide automatic whole-home alarm activation, hardwired backup, room-specific voice messages, or confirmed app alerts.
• The current product page groups Smart App and Interconnected Alarm language beside this standalone model, creating avoidable ambiguity about functions this unit itself does not appear to provide.
• The current model is listed, but the supplied product record lacks a photo of the ETL back-label or production date. That prevents confirmation that a delivered unit is from the current UL 217 9th Edition production.
• A sealed 10-year battery prevents routine replacement, but it also means the complete alarm becomes electronic and lithium-battery waste at end of life. Clear U.S. recycling instructions were not located.

Who is it for

This set suits a homeowner or renter who needs three independent combination smoke and CO alarms in locations where hardwiring is impractical, such as bedrooms, hallways, or a finished basement. It is most appropriate for buyers who value a sealed long-life battery, a local LCD CO indication, and straightforward screw mounting, and who can place each alarm according to the installation instructions. It also fits households that do not need every alarm to activate together or send remote notifications.

Who is it not for

It is not suited to homes that require a code-specified hardwired and interconnected alarm system, or where occupants need one activated alarm to notify the entire house. It is also a poor fit for buyers seeking verified phone alerts, professional monitoring, voice evacuation instructions, or an app-managed safety system. Buyers receiving older stock should not rely on a web listing alone, because the model's current standard status should be confirmed from the physical ETL label and manufacture information.

Integrity

The core health evidence is stronger than a self-declared standards claim. Intertek's ETL directory identifies SC01 as a listed battery-operated photoelectric smoke and carbon monoxide alarm evaluated to UL 2034. X-Sense identifies current SC01 production as meeting UL 217 9th Edition. That newer smoke-alarm standard addresses more demanding fire scenarios and includes a cooking-nuisance test, though NIST research shows compliant modern alarms can still nuisance-alarm during some cooking activities. Correct placement remains important. X-Sense publicly acknowledges that certain earlier U.S. units were produced to UL 217 6th Edition and offers an upgrade or refund program for qualifying purchases from June 30, 2024 through December 31, 2025. No product-specific CPSC recall was located in the searched public recall sources. The sealed battery can reduce disposable battery use over its stated life, but the whole alarm needs responsible electronics and lithium-battery recycling when its end-of-life signal occurs.

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#4

Heiman Smart Wireless Smoke Detector Set

Buyer Score 87/100Integrity Score 75/100HEIMAN

Overview

This package is sold as six compact, battery-powered S1-R photoelectric smoke alarms plus a Wi-Fi gateway for phone alerts and smart-home connections. The alarms are intended for ceiling or wall installation, with the RF link designed to make multiple alarms sound together when one detects smoke. It is a smoke-only system, not a carbon-monoxide alarm. The most important independent finding is that Intertek's current public ETL directory lists the exact S1-R model as a battery-operated photoelectric smoke alarm evaluated to UL 217 Edition 9. Heiman states that the S1-R uses 915 MHz local wireless linking, sounds at least 85 dB at 10 feet, and has an 8.3-year battery life with a 10-year sensor lifespan. Those manufacturer specifications conflict with this product page's claims of UL 217 10th Edition and a 10-year battery.

What works

• The exact S1-R model is independently listed by Intertek to UL 217 Edition 9.
• Each alarm has a local audible warning rated by Heiman at at least 85 dB at 10 feet.
• Heiman states that the proprietary 915 MHz alarm link operates locally, so primary interconnection does not depend on home Wi-Fi.
• The system is smoke-only, with no unsupported carbon-monoxide or air-quality protection implied.

What does not

• The product page's UL 217 10th Edition claim conflicts with Intertek's exact-model listing, which specifies UL 217 Edition 9.
• The advertised 10-year battery claim conflicts with Heiman's current S1-R specification of 8.3 years.
• Remote phone alerts require the gateway, home internet, and app access, so they are supplemental rather than primary warning.
• The smart app has a published privacy policy and offers remote updates, but no model-specific security-update duration or end-of-support commitment was found.

Who is it for

This product fits a household that needs several smoke alarms to sound together in an existing home where adding interconnect wiring would be disruptive. Its compact battery format and manufacturer-stated local RF linking are practical for bedrooms, hallways, finished basements, rentals where installation permission is available, and multilevel layouts. It also suits users who want gateway-based phone notifications as a secondary alert layer, while understanding that the local sirens and regular button testing remain the primary safety functions.

Who is it not for

It is not suited to homes needing carbon-monoxide protection from the same devices, including homes with fuel-burning appliances, fireplaces, attached garages, or generators. Those conditions call for appropriately listed carbon-monoxide alarms in addition to smoke detection. It is also a poor fit for people who need confirmed spoken hazard or room-location messages, visual alerting for hearing-impaired occupants, or a documented long-term cybersecurity support commitment. Verify the physical product label before installation because the listing's certification and battery claims conflict with current manufacturer and Intertek records.

Integrity

The key health positive is an independently traceable U.S. life-safety listing. Intertek identifies the exact S1-R as a battery-operated photoelectric smoke alarm evaluated to UL 217 Edition 9. Heiman specifies a local 85 dB alarm and RF interconnection, meaning core audible warnings are not dependent on a phone or internet service. This set does not detect carbon monoxide, so smoke protection should not be mistaken for protection from combustion gas. Battery and disposal claims need caution. Heiman's current S1-R page states an 8.3-year battery life and a 10-year sensor lifespan, while the product page says 10-year battery life. The alarm contains a lithium battery and electronics, yet model-specific recycling instructions were not located. Do not place it in household trash where local rules prohibit batteries or electronics. No model-specific CPSC recall was located in the reviewed public recall resources, and the manufacturer provides a traceable company contact.

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#5

Wireless Smoke and CO Detector 6-Pack

Buyer Score 84/100Integrity Score 82/100X-Sense

Overview

This is a six-unit set of battery-powered, ceiling or wall-mounted combination smoke and carbon monoxide alarms. Each unit uses a photoelectric smoke sensor and electrochemical carbon monoxide sensor, plus an LCD, test and silence button, and radio link intended to make connected alarms sound together. It is designed for ordinary indoor family living spaces, not kitchens, garages, bathrooms, or commercial or industrial installations. The key evidence is strong for the claimed smoke and carbon monoxide functions. Intertek's current listed-product directory specifically names this product among battery-operated photoelectric smoke and carbon monoxide alarms evaluated to UL 2034. Independent product-label imagery also shows an ETL mark and claims certification to UL 217 ninth edition and UL 2034 fifth edition. The manufacturer states that two nonreplaceable CR123A lithium batteries provide a 10-year life, that up to 18 compatible units can link, and that the local alarm is at least 85 dB at 10 feet. Its product page confusingly advertises a smart app, while its own FAQ says this radio-only version is not Wi-Fi compatible and cannot use an app.

What works

• The exact product is named in Intertek's listed-product directory for residential carbon monoxide detection to UL 2034.
• Independent product-label imagery identifies ETL listing and certification claims to UL 217 ninth edition and UL 2034 fifth edition.
• Each unit has a local audible alarm, visual indicator, smoke and CO alarm patterns, and an LCD CO display, as documented in the manual.
• Radio interconnection does not depend on home Wi-Fi, cloud service, or phone access, according to the manufacturer.

What does not

• The manufacturer's own product page lists a smart app, but its FAQ says this version cannot use an app, Wi-Fi, Alexa, or other assistants. That is a direct claim-scope contradiction.
• No product-specific independent fire-response or cooking-nuisance performance report was located. The certification evidence is strong, but it is not the same as published testing of this exact unit in a kitchen.
• The sealed lithium batteries cannot be replaced. A low-battery, fault, or end-of-life signal requires replacing the complete alarm.
• The manual excludes kitchens, garages, bathrooms, furnace rooms, and commercial or industrial settings, so placement planning is essential.

Who is it for

This set suits an owner of a multi-room or multi-story home who needs several battery-operated combination alarms to sound together without running interconnect wiring. It fits retrofit situations where access to wiring is difficult and where a phone alert is not a required part of the warning plan. The six-unit format is practical for covering sleeping areas, hallways, and living spaces when locations are selected according to the manual and applicable local requirements. The 10-year sealed battery is useful where routine battery changes are likely to be missed.

Who is it not for

It is not suited to buyers who need phone notifications, Alexa control, professional monitoring, or cloud-connected status information. Despite a confusing app claim on the product page, the manufacturer says this version is not Wi-Fi compatible. It is also not for commercial or industrial installations, or for mounting in garages, kitchens, bathrooms, furnace rooms, or locations outside its temperature and humidity limits. Households that need hardwired alarms, specific voice and location messaging, or compatibility with a particular existing interconnect system should confirm those requirements separately.

Integrity

The central health finding is that the exact product appears in Intertek's directory as a battery-operated photoelectric smoke and carbon monoxide alarm evaluated to UL 2034. Product-label imagery separately shows an ETL mark and smoke certification claim to UL 217 ninth edition. That matters because the newer UL 217 requirements include tougher polyurethane fire scenarios and a cooking-nuisance test. Certification does not eliminate cooking alarms, and NIST research found current-generation alarms still varied in nuisance resistance across cooking scenarios. The unit uses photoelectric smoke sensing rather than an ionization source, and an electrochemical sensor for carbon monoxide. Its two sealed lithium metal batteries are manufacturer-stated to last 10 years, which can reduce routine battery replacement and premature disposal. The tradeoff is that the entire alarm must be replaced at battery end of life. The manual gives disposal instructions but does not provide detailed U.S. recycling guidance for the integrated batteries. EPA guidance says lithium primary batteries and electronics should be kept out of household recycling and managed through appropriate battery or electronics collection options.

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#6

Heiman 3-Pack Smart CO Detectors with Gateway

Buyer Score 82/100Integrity Score 74/100HEIMAN

Overview

This product is a three-unit residential carbon monoxide alarm set with a gateway. Each C1-R is a round, battery-powered alarm intended for wall or ceiling mounting. HEIMAN specifies a 3 V CR123A lithium battery, a proprietary 915 MHz radio link, local audible and visual warning, and a claimed sound level of at least 85 dB at 10 feet. The manufacturer also identifies an electrochemical CO sensor and a 10-year service claim. This is not a smoke alarm, heat alarm, natural-gas detector, or general air-quality monitor. The product manual expressly limits detection to carbon monoxide at the sensor. HEIMAN states that the model is ETL Listed to UL 2034, and a manufacturer manual says it conforms to UL 2034 and CSA 6.19-17. FCC authorization evidence supports the presence of the 915 MHz radio, but it does not independently establish the product's life-safety listing. An issuing-body directory match for the exact model was not located during this review.

What works

• The product has a clear CO-only scope, which reduces the risk of mistaking it for a smoke or combustible-gas alarm.
• The manual documents a local audible alarm, flashing indication, test button, hush function, low-battery signal, malfunction signal, and end-of-life signal.
• HEIMAN states that linked C1-R alarms use local 915 MHz radio communication, so primary alarm propagation is designed not to depend on household Wi-Fi.
• The manufacturer states that the system can provide room-specific information through a compatible gateway or app.

What does not

• It cannot replace smoke alarms, heat alarms, or combustible-gas detectors. Its manual specifically says it does not detect smoke, fire, or other gases.
• The claimed ETL listing to UL 2034 is plausible and appears in HEIMAN materials, but this review did not locate a current issuing-body directory record matching the exact model and label.
• The product's smart functions introduce account and household-data handling. HEIMAN's privacy policy describes collection of device identifiers, Wi-Fi information, location-related data, logs, and room settings for some functions.
• Public documentation provides limited detail on a defined security-update period, end-of-support commitment, vulnerability disclosure process, or electronics and lithium-battery recycling instructions.

Who is it for

This product suits a household that needs interconnected carbon monoxide coverage in a home with fuel-burning appliances, a fireplace, generator exposure, or an attached garage, and that already understands it must maintain separate smoke alarms. It is especially relevant where running interconnect wiring is impractical, because HEIMAN states the C1-R units communicate by local 915 MHz radio. Buyers should be comfortable following placement, weekly testing, battery, and end-of-life instructions, and should treat the app and gateway as supplemental notification rather than their sole warning path.

Who is it not for

It is not for anyone seeking a single device to address smoke, fire, CO, natural gas, propane, or indoor-air-quality hazards. The manual limits this product to carbon monoxide detection. It is also unsuitable as a substitute for code-required hardwired alarms where a local authority requires that arrangement. Households needing independently documented confirmation of the exact current U.S. life-safety certification should seek that confirmation from the physical product label and the issuing laboratory before relying on installation. People unwilling to use connected-app data practices should avoid enabling the smart functions.

Integrity

The key health point is scope. This product is intended to warn of carbon monoxide, a colorless toxic combustion gas, through a local horn and visual indication. HEIMAN specifies an electrochemical sensor, a local alarm of at least 85 dB at 10 feet, and RF-linked alarms. The manual gives emergency instructions, requires regular testing, and says the alarm does not detect smoke, fire, or other gases. A separate smoke alarm remains necessary. HEIMAN claims ETL certification to UL 2034 for this model, but an exact current directory match from the issuing laboratory was not found in this review. No product-specific CPSC recall or safety warning was located. The C1-R uses a lithium CR123A battery and is an electronic device, so it should not enter household trash where local battery or e-waste rules prohibit it. HEIMAN's public materials did not provide clear product-specific recycling guidance or a published long-term security-support commitment.

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#7

Eufy Security Smoke Alarm E10

Buyer Score 80/100Integrity Score 84/100eufy Security

Overview

This is a compact, battery-operated photoelectric smoke alarm for a eufy HomeBase system. It measures about 2.75 inches across, uses a replaceable CR123A lithium battery, and is intended for ceiling or wall installation in sleeping areas, halls, and other residential locations. It is smoke-only protection, not a carbon monoxide, heat, or gas alarm. The core fire-safety claim is independently supported. Intertek lists this exact product as an ETL Listed, battery-operated photoelectric smoke alarm evaluated to UL 217 10th edition. The product manual states an on-device alarm of at least 85 dB at 3 meters, weekly testing, a 10-minute hush control, and distinct low-battery, malfunction, and end-of-life signals. Smart setup requires a compatible HomeBase, while the manual correctly describes phone notifications as supplemental rather than life-safety monitoring.

What works

• The exact product is ETL Listed to UL 217 10th edition, verified in Intertek's public directory.
• It is a smoke-only alarm, so its hazard scope is clear and does not imply carbon monoxide or heat detection.
• The manufacturer documents a local 85 dB alarm, physical test and hush button, plus distinct battery, fault, and end-of-life warnings.
• The replaceable CR123A battery compartment prevents mounting the unit without a battery, according to the manual.
• The manual gives explicit placement, cleaning, weekly-testing, escape-planning, and replacement guidance.

What does not

• The smart functions require a compatible HomeBase, and remote alerts depend on the gateway, network, app, and account.
• There is no verified documentation that an alarm from one unit will sound every other compatible alarm locally during a fire.
• The product gives beeps and indicator lights, not spoken hazard or room-location messages, and it is not suitable for people needing visual or vibration alerts.
• The current manufacturer page describes UL 217 10th edition, while an available product manual still uses 9th-edition wording. The current Intertek record supports the 10th-edition listing, but the documentation should be kept consistent.
• The claimed five-year battery life is manufacturer-stated and is based on internal testing. Recycling directions for the lithium battery and retired alarm are not clearly provided in the manual.

Who is it for

It suits a household that already uses a compatible eufy HomeBase and wants a compact, independently listed smoke alarm with app-linked event notifications as an added convenience. It is especially relevant for conventional indoor residential locations such as bedrooms, sleeping-area halls, living spaces, and finished basements, provided placement follows the manual. The buyer should be able to hear an 85 dB local alarm, perform weekly tests, replace a CR123A battery when prompted, and maintain a separate carbon monoxide alarm where that protection is needed.

Who is it not for

It does not suit a household seeking a combined smoke and carbon monoxide product, a heat alarm for a garage or kitchen, or a device with spoken room identification. It also is not appropriate as the sole accommodation for residents who are deaf or hard of hearing and need visual or vibrating notification. Renters and homeowners whose local code, insurer, landlord, or existing wiring requires hardwired interconnected alarms should confirm those requirements first. It is also a poor fit for anyone unwilling to operate a compatible HomeBase or accept that remote alerts rely on networked services.

Integrity

The most important safety finding is the verified listing. Intertek identifies this exact product as an ETL Listed, battery-operated photoelectric smoke alarm evaluated to UL 217 10th edition. That supports its smoke-detection function, but it does not add carbon monoxide protection. A separate listed carbon monoxide alarm remains necessary where carbon monoxide detection is appropriate. The manual also warns that app alerts are ancillary, which is the right safety framing for a connected alarm. The unit uses a replaceable 3 V CR123A lithium battery. Eufy states up to five years of normal battery life, while the manual directs replacement of the whole alarm after 10 years and signals low battery, fault, and end of life locally. Replaceable power can avoid premature replacement, but it also creates a lithium-battery disposal responsibility. The manual does not provide clear recycling instructions for either the cell or the retired electronic alarm. No product-specific CPSC recall or safety warning was identified in the review.

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#8

First Alert SC5 Smoke & CO Alarm

Buyer Score 79/100Integrity Score 79/100First Alert

Overview

This is a hardwired residential combination smoke and carbon monoxide alarm with Wi-Fi, wired interconnection, wireless interconnection capability, voice alerts, and a replaceable 3V lithium backup battery pack. The installation guide specifies 120V AC input and an 85 dB minimum local alarm at 10 feet. It uses distinct three-pulse smoke and four-pulse CO audible patterns. The manufacturer documentation for this exact product says it conforms to UL 217 and UL 2034, and describes CO alarm timing aligned with UL 2034. However, this review could not independently match the exact product to a current public UL or ETL certification-directory record. Its documented hardwired interconnect remains a meaningful primary safety function, while app notifications and cloud access are supplemental features rather than the only warning path.

What works

• Manufacturer documentation specifies 85 dB minimum local sound at 10 feet, plus distinct smoke and CO alarm patterns.
• The hardwired interconnect is documented to activate all connected compatible alarms when one alarm triggers.
• The product supports a lithium backup pack, so documented local alarm operation is not dependent only on household AC power.
• Voice Heads-Up alerts are documented to identify the danger type and programmed location.

What does not

• The exact product's UL 217 and UL 2034 conformity claim could not be independently confirmed in a public third-party listing registry.
• No product-specific independent fire-response or cooking-nuisance test report was located. Updated UL 217 testing improves coverage, but it does not eliminate cooking nuisance alarms.
• The manufacturer has a privacy statement and vulnerability-reporting channel, but no clear product-specific security-update duration or end-of-support commitment was found.
• The documentation gives recycling guidance for the product, but does not clearly state a fixed service-life or replacement date for this model.

Who is it for

This product suits a homeowner replacing a compatible hardwired residential smoke and CO alarm, especially where existing orange, red, or yellow interconnect wiring is present. It also fits households that want each connected alarm to sound locally throughout the home and want supplementary phone notifications. The installation guidance assumes indoor residential placement and electrical work that complies with applicable local code. A qualified electrician is appropriate where wiring, compatibility, or local requirements are uncertain.

Who is it not for

It is not for a buyer who needs independently verifiable public certification-directory evidence for the exact product before installation. It is also not a substitute for a building fire-alarm system in hotels, large multifamily common areas, industrial facilities, or other occupancies requiring a complete supervised system. Households without compatible hardwired infrastructure may not benefit from its main installation format. Buyers who do not want an account-connected product should also note that app features require cloud setup, even though local detection remains documented without cloud connection.

Integrity

The health-relevant strength is the product's documented local safety path. Its guide specifies an 85 dB minimum alarm at 10 feet, separate temporal patterns for smoke and CO, voice warnings, AC power, and a lithium backup pack. The manufacturer also documents wired interconnection, so a triggering compatible alarm can cause others to sound. The exact manual says the product conforms to UL 217 and UL 2034, but a public third-party registry match for this exact product was not located during verification. No exact-product CPSC recall or safety warning was found in the checked public sources. The manufacturer provides support and warranty channels. For end of life, the guide says not to place the product in household waste and directs users to authorized collection or recycling channels. The replaceable lithium backup pack avoids discarding the full product for every battery change, but lithium batteries and the electronic alarm still need appropriate recycling.

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#9

Kidde Smart Smoke Detector Ring App Enabled

Buyer Score 76/100Integrity Score 80/100Kidde

Overview

This is a round, battery-powered residential smoke alarm with a photoelectric smoke sensor, two replaceable AA batteries, Wi-Fi connection to the Ring app, and a separate radio link for wire-free interconnection with compatible units. It is a smoke-only product, not a carbon monoxide alarm. It measures about 5 inches across and is intended for ceiling or wall installation in a home. The exact product manual states that it conforms to UL 217 and identifies an FCC authorization for its radio. The manual also specifies an 85+ dB alarm at 10 feet, a repeating spoken “Fire” warning, and a 10-year end-of-life replacement alert. Kidde's claims of faster detection and reduced cooking nuisance alarms are based on its own testing, not an independent product-specific test found in this review.

What works

• The exact manual identifies this model as smoke-only, which avoids implying carbon monoxide protection that it does not provide.
• The local alarm is specified at 85+ dB at 10 feet and includes a repeating spoken fire warning.
• Compatible wire-free interconnected alarms are specified to sound together, including when Wi-Fi setup is skipped or unavailable.
• The manual specifies self-testing, weekly manual testing, low-battery warnings, fault messages, and a 10-year replacement alert.
• The radio-bearing product is identified with an FCC ID in the exact manual, and the manual states it complies with FCC Part 15.

What does not

• A manufacturer statement that the product conforms to UL 217 was found, but an exact-model entry in a public UL or ETL certification registry was not located during verification.
• The product has no carbon monoxide sensor. Homes needing CO protection need a separately appropriate CO alarm or combination alarm.
• Ring notifications require 2.4 GHz Wi-Fi, internet access, the Ring app, and a compatible phone. The manual correctly describes mobile alerts as supplemental, not life-safety monitoring.
• Kidde's faster-detection and cooking false-alarm claims are internal comparisons. Independent research shows modern alarms can still nuisance alarm during varied cooking events.
• It uses two disposable AA alkaline batteries, which the manufacturer says normally require annual replacement. Poor Wi-Fi or interconnect signal can shorten battery life.

Who is it for

This product suits a household that needs a smoke-only alarm for a location where carbon monoxide detection is not required, and that can keep up with annual AA battery replacement and weekly testing. It is particularly relevant for a home using compatible current Kidde wire-free alarms, because the manual describes local interconnection without depending on Wi-Fi. It also fits users who want supplemental Ring notifications, understand that they require a 2.4 GHz network and app setup, and still prioritize the audible in-home alarm.

Who is it not for

It is not for a location that needs carbon monoxide detection, because this exact product detects smoke only. It is also not a fit for buyers who expect app alerts, cloud connectivity, or optional monitoring to substitute for a local alarm, safe escape plan, or correctly placed alarms. Households unable to replace alkaline batteries about yearly, test alarms weekly, or maintain compatible interconnect setup should consider an alarm format better matched to those constraints. It is not designed for boats or recreational vehicles.

Integrity

The safety case is strongest for the local functions described in the exact manual. It specifies a photoelectric smoke sensor, an 85+ dB local alarm, spoken fire alerts, self-testing, battery and fault warnings, and an end-of-life signal after 10 years. The manual states that the smoke-only model conforms to UL 217 and identifies its FCC authorization. Public registry verification for the exact model was not located, so that conformity statement should not be mistaken for an independently matched public listing record. The product uses two replaceable AA alkaline batteries and the manual says to remove them before disposal. Annual battery changes create recurring waste, although the stated 10-year service life can reduce premature whole-unit replacement. EPA guidance encourages recycling alkaline batteries where programs are available or checking local rules. The exact model was not found in the CPSC recall records searched, while Kidde provides a 10-year limited warranty and named support contact.

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#10

Kidde Gas and Carbon Monoxide Detector

Buyer Score 75/100Integrity Score 71/100Kidde

Overview

This is a plug-in residential carbon monoxide and combustible-gas alarm, not a smoke alarm or a smart-home alarm. It plugs into 120 V power, uses a replaceable 9V battery for short-term backup, and is intended to detect carbon monoxide plus natural gas or propane in ordinary indoor family living areas. Kidde specifies an electrochemical CO sensor, a metal-oxide gas sensor, a digital CO display, peak-level memory, and an 85+ dB local sounder. Kidde states that the product is listed to UL 2034 for carbon monoxide. Separately, an NFPA Research Foundation report identifies this exact model as UL 1484 certified for combustible gas detection. Its own manual explicitly says it does not detect smoke or fire, so it cannot replace properly installed smoke alarms. It is a single-station product with no interconnection, Wi-Fi, app, or remote notifications.

What works

• Independent NFPA documentation identifies this exact model as UL 1484 certified for natural-gas and propane detection.
• The manufacturer documents a 9V backup mode that continues CO and gas monitoring after an AC outage, provided the battery is charged.
• The local warning is specified at 85+ dB at 10 feet, with distinct display information for CO concentration and gas detection.
• The manual gives clear low-battery, malfunction, end-of-life, and replacement instructions, including a replacement date seven years after power-up.
• No connected account, radio, cloud service, or app is involved, which avoids smart-device privacy and service-continuity exposure.

What does not

• It is not a smoke or fire alarm. The manual expressly says it cannot provide early fire warning, despite this product appearing under a smoke-detector search category.
• It does not interconnect with other alarms and has no remote notification, so an event is only communicated by this unit's local alarm.
• UL 2034 listing is stated in Kidde's own documentation, but an exact current registry match in UL Product iQ was not publicly confirmed in this review.
• The 9V battery backup is short-term. The manual warns that a depleted battery means the product will not detect CO or gas during an outage.
• The sealed electronic unit must be replaced at end of life, and the manual does not provide product-specific electronics recycling instructions.

Who is it for

This product suits a household that already has working smoke alarms and needs a local, outlet-powered alarm near a residential fuel-burning appliance or gas service area. It is especially relevant where natural gas or propane is present and where occupants want one device that provides carbon monoxide and combustible-gas warning, a numeric CO display, and short-term outage backup. It fits users able to test the unit weekly, replace the 9V battery when warned, and write down the required seven-year replacement date.

Who is it not for

It is not for anyone seeking smoke detection, kitchen-fire detection, whole-home interconnection, app alerts, or alerts while away from home. It is also unsuitable as the only alarm in a dwelling because it cannot sense smoke or fire, and it only detects hazards at its own sensor location. Households with interconnected alarm requirements, accessibility needs that call for visual or bed-shaker notification, commercial or industrial settings, hazardous locations, or a need for low-level occupational CO measurement need equipment designed and listed for those uses.

Integrity

The important health distinction is that this product covers carbon monoxide and combustible gas, not smoke or fire. Kidde's manual is unusually direct on that limit and instructs households to maintain separate smoke alarms. The manufacturer documents an 85+ dB alarm, different gas and CO indications, low-battery and fault signals, and an end-of-life warning. An NFPA Research Foundation report independently lists this exact model as UL 1484 certified for combustible-gas detection. Kidde's product sheet states UL 2034 listing for its CO function, although this review did not obtain a public exact-model registry result. The stated service life is seven years from power-up, after which the sealed unit should be replaced. It also uses a replaceable, nonrechargeable 9V backup battery. That reduces outage vulnerability but creates recurring battery waste. The manual lacks product-specific recycling guidance, so owners should use local electronics recycling options for the retired alarm and follow local battery-disposal guidance for the 9V battery. No current Kidde safety notice located in this review names this exact model.

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