First Alert CO910  10-Year Carbon Monoxide Alarm, White CO detector alerts you to elevated carbon monoxide levels Sleek, modern design mounts on the wall or stands on a tabletop Built-in 10-year battery offers continuous protection for the life of the carbon monoxide detector 85-decibel alarm can be heard easily Single test/silence button for simple operation Complies with all current 10-year legislation in states/cities where required No Battery Changes for the Life of the Alarm; 3V Lithium Power Cell Included New sleek and thin design adds an element of style to safety Power LED and Alarm Indicator Mute/Silence Button and End of Life Signal