The Kidde K10LLCO carbon monoxide alarm features a 10 yearsealed lithium battery designed to last for the life of the alarm, and iscoupled with a 10 year manufacturer's warranty for peace of mind. Fullycertified and Kitemarked to BS EN 50291-1, this alarm uses clear LED indicatorsto display Power (Green), Fault (Amber) and Alarm (Red) states.