First Alert 1039760 3-in-1 Explosive Gas & Carbon Monoxide Alarm

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