The First Alert(R) SMCO200V Battery-Operated 2-in-1 Smoke Alarm and Carbon Monoxide Alarm provides reliable protection against both threats. Its alarm features voice and location alerts to help you escape safely. Our Precision Detection advanced-sensing technology complies with the latest industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency. The voice and location alert feature tells you what the danger is and its location to help you escape safely. This combo smoke and CO detector also has a slim profile, measuring only half the depth of a standard alarm. The sleek, modern design seamlessly blends into most decor and is easy to install throughout your home.