The First Alert SMCO500V interconnect battery-operated combination smoke and carbon monoxide with voice and location alerts helps provide an early warning and guide your escape to safety. Also equipped with First Alert’s precision detection advanced sensing technology that meets new industry standards.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 emergencyThrough early warning interconnect, when one alarm sounds, all compatible alarms will soundVoice and location alerts tell you what the danger is and its location to help you escape safelyBattery-operated alarm is easy to install and maintainProvides reliable 2-in-1 protection against both smoke and carbon monoxideTest/silence button for efficient testing to ensure alarm is working properlyEnd-of-life warning lets you know when it’s time to replace the alarm