The First Alert® battery-powered explosive gas alarm protects your home and family against three dangerous gases: carbon monoxide, propane and natural /
methane gas. The alarm features a backlit digital display that illuminates to display which hazard, hazard levels and peak levels detected when the alarm sounds. The unit plugs into any standard outlet and includes a battery backup for full protection during a power outage. The detector also comports an end-of-life and low battery signals as well as a single test-silence button. This product is backed by a 5-year limited warranty.