FIRST ALERT 1039860 SMK/CO2 10YR BATT SLIM

First Alert 10 Year Battery Powered Smoke and Carbon Monoxide Alarm. Protect your home and family from both fire and dangerous carbon monoxide with a nuisance free alarm that you can install in any room of the house. The PRC710A is a battery powered combination photoelectric smoke alarm and carbon monoxide alarm, with a 10 year sealed lithium battery. You won't need to worry about battery changes or nuisance beeps due to low batteries, for the entire life of the detector.