Battery-Powered Ionization Smoke and Carbon Monoxide Detector

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 Provides reliable 2-in-1 protection against both smoke and carbon monoxide End-of-life warning lets you know when it’s time to replace the alarm Battery-operated alarm allows for easy installation and maintenance Test/silence button for efficient testing to ensure alarm is working properly