First Alert GCO16CNA Combination Explosive Gas and Carbon Monoxide Alarm with Backlit Digital Display. Featuring a backlit digital display, this explosive gas and CO detector plugs into any AC outlet with no additional mounting hardware needed.Designed to promote peace of mind and household safety, the GCO16CNA Combination Explosive Gas and Carbon Monoxide Alarm accurately senses the presence of methane and propane. It also features an advanced electrochemical CO sensor that detects carbon monoxide leaks from a variety of sources, such as faulty fuel-burning appliances, blocked chimneys, and cars left running in the garage. When the alarm detects a threat, it alerts you with a loud 85-decibel alarm.Equipped with a backlit digital display, the GCO16CNA Combination Explosive Gas and Carbon Monoxide Alarm takes the hassle out of monitoring CO and explosive gas levels in your home. The display gives you a clear readout of current and peak levels, allowing you to discern patterns that indicate potential leaks from an appliance, a generator, or other source.This alarm is easy to set up and doesn't require any wiring or the help of an electrician. The compact, low-profile unit plugs cleanly into an AC wall outlet without obstructing other sockets and comes with a line cord for versatile placement options. The alarm also features a 9-volt backup battery to help ensure continued operation in the event of a power outage. A pivoting, easy-to-access battery drawer allows you to replace the battery without dismounting the alarm.For added convenience, the alarm can be configured to work with almost any standard household remote control (not included), so you can remotely silence false alarms. A one-touch silence/test button makes it easy to test the detector or mute it during a false alarm. And thanks to the end-of-life timer, you can know exactly when it is time to replace your alarm.