DESC: The new Kidde KN-COPP-B Carbon Monoxide Alarm is the only battery-operated alarm that includes a backlight digital display feature This key feature adds an advanced level of protection that you have come to expect in a Kidde manufactured product The battery operated CO alarm includes multiple mounting options allowing installation on a wall or tabletop This alarm has been carefully designed and tested to detect CO concentration in a residential environment Product Features Battery Operated Pro/KNCOPPB/KN COPP B/-Building-Remodeling/Home Safety/Carbon Monoxide Detectors/Kidde