First Alert Plug-In Carbon Monoxide Detector with Battery Back Up CO605 - (Box of 3)

The First Alert Carbon Monoxide Alarm Provides Needed Protection Against Invisible, Odorless, Silent Killer With A Loud 85 Decibel Alarm. No Batteries. Plugs Into Standard 120v Ac Outlet With No Additional Mounting. Features An Endoflife Timer Which Activates A Chirping Alarm When It Needs To Be Replaced. Features A Mute Button To Mute Unnecessary Alarms. You Can Test Alarm Function With The Same Button.