First Alert 1039760 GC01CN Combo Explosive Gas and Carbon Monoxide Alarm with Digital Display

• Versatile alarm senses high levels of propane, natural/methane gas, and carbon monoxide;• Loud 85-dB alarm can be heard easily;• Easy-to-read backlit digital display allows you to view current and peak levels;• Plugs into any AC outlet for easy setup; line cord for versatile placement options;• 9-volt backup battery powers detector in case of power outage; can be replaced without dismounting alarm;• 1-touch silence/test button makes it easy to test detector or mute it during false alarm;• Low-battery warning and end-of-life warning;• Dimensions: 1.8 in. D x 5.6 in. L x 3.1 in. H;• Includes 9-volt battery;