The kidde 10llco carbon monoxide 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 will not have to be changed for the duration of the alarms life the alarm has a unique water based kidde co electrochemical sensor and features an alarm memory meaning that a red led will flash every 60 seconds to indicate a co event has occurred a co quick test feature temporarily desensi