The First Alert® CO400A Carbon Monoxide (CO) Alarm utilizes an electrochemical carbon monoxide sensor that lasts for up to five years to detect carbon monoxide. This carbon monoxide detector is battery operated, making it portable and easy to use anywhere, even in the event of a power outage. When carbon monoxide levels become elevated, a loud 85-decibel alarm alerts you to the threat.

▪ 9V Battery Operated Carbon Monoxide (CO) Alarm
▪ Electrochemical CO Sensor
▪ Two Silence Features: Silences Low Battery Chirps For Up To Eight Hours Or Temporarily Silences Nuisance Alarms
▪ Single Test/Silence Button
▪ End-Of-Life Signal (CO)
▪ 7-Year Limited Warranty
▪ Mfg #CO400A 

Warranty & Returns Policy: All products sold are covered under the manufacturer’s warranty. For any warranty-related issues, please contact the manufacturer directly. For further warranty details or support, refer to the manufacturer’s warranty documentation provided with your product.