First Alert Carbon Monoxide,Alarm,Plug In,No Installation Needed,White - Carbon monoxide alarm provides needed protection against invisible, odorless, silent killer with a loud 85 decibel alarm. No installation needed. No batteries. Plugs into standard 120V AC outlet with no additional mounting. Features an end-of-life 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.
