Kidde 10 Year Carbon Monoxide Alarm – a Sealed Lithium Battery Model K10LLCO You get 10 whole years of non-stop carbon monoxide protection with this sealed lithium battery that just does its thing without ever needing a replacement. The Kidde K10LLCO is certified to BSI standards, has all the features you need like alarm memory, an end-of-life alert and three clear LED indicators. You can install it on a wall, from the ceiling or freestanding - and its light weight makes it portable enough to take on holiday. The trouble with carbon monoxide alarms is that they only work if the battery is working - and batteries just get forgotten or go flat. That's where the Kidde K10LLCO comes in - its sealed lithium battery lasts the full 10 years of the alarm's life without needing to be changed. Just fit it, give it a test and thats it - continuous protectio