First Alert CO710 10-Year Battery Carbon Monoxide Alarm w/ Digital Temperature Display

Battery powered CO Alarm with 10-Year sealed 3V lithium battery features a backlit digital display that shows visual confirmation of CO levels, Peak Level Memory, current room temperature and other operating conditions and Silence feature. Includes electrochemical CO sensor. Features:  Compact, low profile design complements any decor. 10-Year Lithium Power - 10 years of continuous protection. No battery change required. Tamperproof Sealed Alarm - Powercell cannot be removed. Digital Display Electrochemical CO sensing technology Silence feature