First Alert 1046795 2-in-1 Smoke and Carbon Monoxide Alarm, Alarm: Audible, Electrochemical, Photoelectric Sensor

First Alert 2-in-1 Smoke and Carbon Monoxide Alarm, Alarm Type: Audible, Sensor Type: Electrochemical, Photoelectric, Power Source: Battery, Ceiling, Wall Mounting, Dimensions: 6.5 in L x 2.52 in W x 8.5 in H