First Alert SMCO500V, Interconnect Battery-Operated Combination Smoke & Carbon Monoxide Alarm with Voice Alerts, 1-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, Through early warning interconnect, when one alarm sounds, all compatible* alarms will sound, Voice & location alerts tell you what the danger is and its location to help you escape safely, Battery-operated alarm is easy to install and maintain, Provides reliable 2-in-1 protection against both smoke and carbon monoxide