The SMI100 smoke alarm is equipped with First Alert’s precision detection advanced sensing technology and meets new industry standards. This battery-operated alarm is easy to install and the front access battery compartment makes for easy battery replacements.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 emergencyBattery-operated alarm allows for easy installation and maintenanceFront access battery compartment makes for easy battery replacementsEnd-of-life warning lets you know when it’s time to replace the alarmTest/silence button for efficient testing to ensure alarm is working properly