First Alert CO910V  10-Year Carbon Monoxide Alarm with Voice Alert, White Electrochemical Co Sensor New Sleek Design 3v Lithium Power Cell Power Led & Alarm Indicator Mute/silence Button 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 Voice and location alerts identify type and location of danger to plan best escape route 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