Reliable alarm features Memory Scan that retains the carbon monoxide level that activated the alarm. Warning alarm notifies you of moderate levels of carbon monoxide (60ppm) to help protect seniors and children. Loud 85db alarm alerts you to carbon monoxide danger. Power 12V AC, operational range 8-16V. .06A current draw. Operates at -40° to 150° F. Flush mount: 6-1/2"W x 3-1/2"H x 1-1/4"D. White. Three year warranty. UL and CSA listed. 1 per box.