First Alert CO615A Carbon Monoxide Plug-In Alarm with Battery Backup and Digital Display

Plug & Protect, alarm plugs into any standard 120V AC outlet with no additional mounting. Line cord allows for multiple installation options
Ez view backlit digital display, easy viewing of danger levels, current, and peak CO levels in your home. Illuminates only when alarm sounds or a button is pressed
Battery backup, provides consistent protection for added safety during power outages
Ez access battery door, front-open compartment allows easy battery change without dismounting alarm
Mute button silences unnecessary alarms. It also tests alarm function with same button