The kidde kid10lldco 10lldco alarm is a sleek lightweight carbon monoxide co alarm with a non replaceable sealed in lithium battery which provides 10 years of continuous protection meaning that the battery never needs to be changed for the duration of the alarms life the alarm has a digital display which clearly shows the levels of carbon monoxide a peak level display allows the highest co level recorded between 11 999ppm to be displayed the 10lldco has a unique water based kidde co electroche