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First Alert

First Alert Battery Powered Carbon Monoxide Alarm

  • The First Alert CO400A is a battery powered carbon monoxide alarm that runs on AA batteries so that it can be placed wherever it's needed. The alarm has a loud built-in 85dB siren that sounds when the CO is detected. The CO400A is for use indoors and is commonly installed in homes, cottages, RVs, and motor homes for bedrooms, basements, living rooms or near fireplaces or appliances that may potentially emit carbon monoxide. The CO400A uses an electrochemical sensor for increased accuracy and features an easy access battery door, mute/silence button and end-of-life timer to alert when replacement is needed.