The First Alert SM500V interconnect battery-operated smoke alarm with voice and location alerts meets new industry standards featuring First Alert’s precision detection advanced sensing technology. Helps provide an early warning and guide your escape to safety through early warning interconnect and voice alerts.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 the location of danger to help you escape safelyBattery-operated alarm is easy to install and maintainTest/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