First Alert Plug-In 120V Electrochemical Easy To Read Digital Display Carbon Monoxide Alarm

Electrochemical sensor Easy-to-read backlit digital display allows a quick view of current and peak CO levels. Plugs into any wall outlet and includes a battery back-up for detection even during power outages EZ access battery door allows you to change batteries without having to dismount the alarm 5-decibel horn sounds if carbon monoxide levels are too high, and a test/silence button silences the alarm and allows you to test its functionality