BSi Kitemarked to BSEN 50291:2001, Kidde makes 30 million detectors every year, and this could be the best money you ever spent. Our standard version uses standard AA batteries, which will need replacing periodically. The sealed version has a sealed lithium battery, which will last as long as the alarm and is designed to prevent tampering. Use the drop-down menu on the side to select either the standard or sealed battery carbon monoxide alarm. 

PLEASE NOTE - Kidde have DISCONTINUED and replaced the 900-0146 with this model 900-0230. Suitable for any premises where people sleep or live - portable. Full instructions with every detector. Fixing requires two little screws and wallplugs (supplied) to screw to wall.