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The best carbon monoxide detectors for home backup
First Alert CO710 wins for most homes with battery power, clear readings, and a 10-year sealed battery; simpler picks cost less.
| Best overall | Best value | Cheapest that's still good | |
|---|---|---|---|
| Product | First Alert CO710 10-Year Battery Carbon Monoxide Detector | Kidde KN-COPP-B-LPM Battery-Operated Carbon Monoxide Alarm | First Alert CO600 Plug-In Carbon Monoxide Alarm |
| Price | about $40 | about $30 | about $25 |
| Why | Its sealed 10-year battery avoids dependence on household power and routine battery changes, and the digital display makes readings easy to check. It is a practical CO-only choice for most homes that want straightforward backup protection. | SafeWise lists Kidde's battery-operated alarm as its value pick, typically under $35. Its battery operation suits rooms without a convenient outlet and avoids relying on mains power during an outage. | SafeWise identifies the CO600 as its basic option and lists it under $30. It has a battery backup, giving it an advantage over plug-in-only alarms during a power cut. |
| Good to know | It does not detect smoke, and its sealed battery means you replace the whole alarm when it reaches end of life. | It has no digital CO-level display and does not detect smoke. | It depends on an outlet for normal operation and has no digital display or smoke detection. |
| See on Amazon | See on Amazon | See on Amazon |
picture by AIIts sealed 10-year battery avoids dependence on household power and routine battery changes, and the digital display makes readings easy to check. It is a practical CO-only choice for most homes that want straightforward backup protection.
Good to know: It does not detect smoke, and its sealed battery means you replace the whole alarm when it reaches end of life.
See on Amazonpicture by AISafeWise lists Kidde's battery-operated alarm as its value pick, typically under $35. Its battery operation suits rooms without a convenient outlet and avoids relying on mains power during an outage.
Good to know: It has no digital CO-level display and does not detect smoke.
See on Amazonpicture by AISafeWise identifies the CO600 as its basic option and lists it under $30. It has a battery backup, giving it an advantage over plug-in-only alarms during a power cut.
Good to know: It depends on an outlet for normal operation and has no digital display or smoke detection.
See on AmazonDanilli may earn a small commission from Amazon when you buy through these buttons. The price is the same for you. Product pictures are made by Danilli's AI to show the product; check the real photos on the store page.
What matters
Choose a detector with UL 2034 certification and a power source that still works during outages. Put alarms on every level and near sleeping areas, test them monthly, and replace them by the stated end-of-life date.
Who this is for
These picks suit U.S. households choosing standalone alarms for storm and power-outage readiness. Check whether you need CO-only protection or a smoke-and-CO combination, and whether your existing alarms are hardwired or interconnected.
The picks, one by one
Best overall: First Alert CO710 10-Year Battery Carbon Monoxide Detector
Its sealed 10-year battery avoids dependence on household power and routine battery changes, and the digital display makes readings easy to check. It is a practical CO-only choice for most homes that want straightforward backup protection. Consumer Reports' lab tests compare response to low and high CO levels and check the accuracy of displayed readings. The display and peak-level memory can help you see whether CO was detected, while the battery means it can keep operating through a power cut. It detects carbon monoxide, not smoke, so keep working smoke alarms in place. Confirm the model and certification on the listing before buying.
Good to know: It does not detect smoke, and its sealed battery means you replace the whole alarm when it reaches end of life.
See on AmazonBest value: Kidde KN-COPP-B-LPM Battery-Operated Carbon Monoxide Alarm
SafeWise lists Kidde's battery-operated alarm as its value pick, typically under $35. Its battery operation suits rooms without a convenient outlet and avoids relying on mains power during an outage. It is a basic CO-only alarm with a test/reset button and indicator lights. SafeWise's guide compares battery, display, alarm, and smoke-detection features across its selections, rather than publishing a controlled lab response test for every model. It is a sensible lower-cost option if you do not need a digital readout. Check the exact model number, since similarly named Kidde alarms have different features.
Good to know: It has no digital CO-level display and does not detect smoke.
See on AmazonCheapest that's still good: First Alert CO600 Plug-In Carbon Monoxide Alarm
SafeWise identifies the CO600 as its basic option and lists it under $30. It has a battery backup, giving it an advantage over plug-in-only alarms during a power cut. This is a simple CO-only alarm that plugs into an outlet, with a backup battery and a one-button design. SafeWise describes an 85-decibel alarm and a seven-year warranty. It is best where the outlet is not blocked and accessible; for rooms without outlets, choose a battery-powered model instead. Confirm the listing includes the backup battery and the exact CO600 model.
Good to know: It depends on an outlet for normal operation and has no digital display or smoke detection.
See on AmazonHow we chose
Consumer Reports exposed detectors to 100-ppm and 400-ppm carbon monoxide and checked how quickly and accurately they responded; some display models were also checked for reading accuracy. Other reviewers compared setup, alarm features, power backup, and everyday ease of use; test durations varied b Danilli read the reviews and tests listed below and compared current prices; it does not take money from brands to pick a product.
Sources
- Consumer Reports, Best Smoke and Carbon Monoxide Detectors of 2026
- SafeWise, The Best Carbon Monoxide (CO) Detectors of 2026
- This Old House, Best Carbon Monoxide Detectors
- BestReviews, Best Carbon Monoxide Detectors
- Security.org, The Best Carbon Monoxide Detectors of 2026
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Written with Danilli's AI from the sources above and refreshed about once a month; prices change, check Amazon for today's price. Danilli may earn a small commission from Amazon when you buy through these buttons. The price is the same for you. Product pictures are made by Danilli's AI to show the product; check the real photos on the store page.