Plug-in carbon monoxide (CO) alarm with backup battery and digital display

The First Alert CO615 Dual Power Plug-In Carbon Monoxide Alarm alerts you to dangerous levels of carbon monoxide. This plug-in carbon monoxide detector operates on a dual power system with battery backup for continuous monitoring, even in the event of a power outage. The backlit digital display tells you the carbon monoxide and power levels at a glance. The CO alarm also features a convenient test and silence button and an end-of-life warning that lets you know when it's time to replace the alarm.