First Alert 1046796 Smoke and Carbon Monoxide Alarm with Slim Profile Design, Electrochemical, Photoelectric Sensor White (Pack of 4)

The First Alert SMCO210 10 year sealed battery combination smoke and carbon monoxide alarm with slim profile design uses First Alert's precision detection advanced sensing technology and meets new industry standards. This 2-in-1 alarm provides convenient protection against both fire and carbon monoxide (CO). Also equipped with a 10 year sealed battery to eliminate the need for battery replacements and low battery chirps. Online purchases are in packages of 4.