First Alert, Alarm, Smoke & Carbon Monoxide, Photoelectric

Description  Battery operated. Packs premium detection capabilities into a sleek, compact design. Comes equipped with a photoelectric sensor & a patented smoke entry system, allowing reliable detection of smoke produced by smoldering fires while keeping false alarms to a minimum. Features an advanced electrochemical sensor that detects carbon monoxide leaks from multiple sources such as faulty fuel burning appliances & blocked chimneys.