First Alert Battery Operated 3v Photoelectric Carbon Monoxide And Smoke Alarm

Battery-operated combination photoelectric smoke and carbon monoxide alarm packs premium detection capabilities into a sleek, compact design. Half the depth of a standard alarm. Comes equipped with dual sensors for reliable detection of two potentially deadly threats. Patented smoke entry system reduces false alarms. End of life warning indicates when it is time to replace the batteries. Battery life varies according to use and application.