Kidde Carbon Monoxide Detector, Propane, Natural, Methane, & Explosive Gas Alarm, Plug-In Wall with 9-Volt Battery Backup, Digital LED Display

• Easy Installation - simply plug-in to a standard, 120V outlet in your home • 9-volt battery backup provides protection during a power outage • Digital LED display shows the level of carbon monoxide the CO alarm is sensing or states "GAS" when explosive gas is present • 85-decibel alarm announces when carbon monoxide or explosive gas is detected • Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested