First Alert CO910 Carbon Monoxide Alarm

Electrochemical CO sensor; Sleek design; 3V lithium power cell; Power LED & alarm indicator; Mute/silence button; End-of-life signal; Versatile mount--wall or ceiling with easy slide-in mounting bracket; Peak level memory captures highest CO level detected; 10-year alarm life with no battery changes for life; 10-year limited warranty; Without voice alert;