First Alert COBATT-6 Carbon Monoxide Alarm, 6pc: * Specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multi-family dwellings * Features an electrochemical CO sensor, an 85dB horn, End of Life and silence features and a red LED that blinks to indicate unit is receiving power * Front access battery door allows battery access without removing the unit from the wall * Low power warning indicator will cause the alarm to "chirp" when the batteries need replacing * An Alarm Action Chart identifies action steps to take if unit is in alarm * Backlit digital display shows visual confirmation of CO levels * Peak Level Memory, remembers and displays the highest levels detected when the Peak Level button is pressed * Includes mounting anchors and screws * Includes 2 AA batteries