
The basic, battery-operated Kidde 9CO-5 carbon monoxide detector performs well in tests, and is cheaper than the top-rated Kidde Nighthawk 900-0076 (*est. $50) because it lacks a digital display. Bear in mind, though, that most experts prefer CO detectors with digital readouts, which continually display carbon monoxide gas levels in the home, and can alert you to borderline levels that may not yet be dangerous. The Kidde 9CO-5 has a green LED that flashes every 30 seconds to indicate that the unit is working properly, a test/reset button and multiple mounting options.
Consumer Reports magazine tests and rates numerous carbon monoxide detectors, including the Kidde 9CO-5, in its 2008 category roundup.

| Kidde KN-COB-B Battery-Operated Basic Carbon Monoxide Alarm with Electrochemical Sensor, 1-Pack | |
(22 reviews) In Stock. |
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Our Sources
1. ConsumerReports.orgDetails/Subscribe
Consumer Reports tests carbon monoxide detectors; this latest update including multiple models from Kidde Nighthawk. CO detectors are rated on sensitivity to low and high levels of carbon monoxide gas.
Review: Buyers' Guide to Smoke and Carbon Monoxide Alarms, Editors of Consumer Reports, Feb. 2008
2. Amazon.com
There are only about a dozen user reviews here for the basic Kidde battery-operated CO detector, but most are positive. One owner reports false alarms.
Review: Kidde KN-COB-B Basic Carbon Monoxide Alarm, Contributors to Amazon.com
Carbon Monoxide Detectors Runners Up:
1 pick including: Amazon.com…
1 pick by top review sites.
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Kidde KN-COSM-IB Hardwire Combination Carbon Monoxide and Smoke Alarm with Battery Backup and Voice Warning, Interconnectable
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Kidde KN-COPF-i Silhouette Wire-in Low Profile Carbon Monoxide Alarm
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