First Alert CO615
First Alert CO615

Best plug-in carbon monoxide detector

The First Alert CO615 is an effective and easy-to-use plug-in carbon monoxide detector that can run on its battery backup during power outages. It is recommended by one professional testing organization and generally receives positive reviews from individual users. However, its poorly constructed battery cover frustrates many owners.
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First Alert CO-400
First Alert CO-400

Battery-operated carbon monoxide detector

The First Alert CO-400 is a basic carbon monoxide detector that runs on two AA batteries, giving users more placement options than plug-in models. This is a good model for people who simply want to be alerted when carbon monoxide is detected. But owners who want more data from their units, such as current CO levels, should look elsewhere.
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Kidde KN-COSM-B
Kidde KN-COSM-B

Combination carbon monoxide smoke detector

The Kidde KN-COSM-B is a dual alarm, sensing for both smoke and carbon monoxide. Verbal warnings and a loud horn alert owners about the nature of the emergency. The unit runs on three AA batteries and is easy to install. It also fits on the older model's mounting plate.
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See a side-by-side comparison of key features, product specs, and prices.

Carbon Monoxide Detectors Runners Up:

First Alert Onelink SCO501CN Est. $60

3 picks including: Amazon.com, ConsumerReports.org…

Kidde KN-COPP-B-LP Est. $30

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Kidde KN-COPP-3 *Est. $45

1 pick including: Amazon.com, HomeDepot.com…

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