First Alert Battery-Powered Photoelectric Smoke and Carbon Monoxide Combination Pack

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency 10-Year sealed battery eliminates battery replacements and low battery chirps for the life of the alarm Slim profile design is half the depth of a standard alarm End-of-life warning lets you know when it’s time to replace the alarm First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency