Alarm

First Alert 1039727 Alarm, Digital Display, 85 dB, Alarm: Audible, Electrochemical SensorBe alerted to dangerous carbon monoxide leaks with the first alert CO410 battery-operated carbon monoxide alarm with backlit digital display. This carbon monoxide detector uses an electrochemical carbon monoxide sensor. An easy-to-read backlit digital display allows a quick view of current and peak CO levels. This unit is powered by two replaceable AA batteries, offering peace of mind even during power outages.Features: EZ view backlit digital display allows easy viewing of danger levels, current and peak CO levels in your home EZ access battery door, front-open compartment allows easy battery change without dismounting alarm Mute button silences unnecessary alarms, it also tests alarm functions with same button Low battery signal mute, quiets low battery signal for up to 8 hrs Electrochemical sensor, most accurate technology available for detecting carbon monoxide compared to other common sensing