Illuminate your path to safety with the First Alert SM210L 10 year sealed battery smoke alarm with safety path light. The SM210L smoke alarm also features First Alert’s precision detection advanced sensing technology and meets new industry standards. The 10 year battery means no battery replacements for a decade.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 emergencySafety path light helps illuminate your path to safety in case of emergency10 year sealed battery eliminates battery replacements and low battery chirps for the life of the alarmEnd-of-life warning lets you know when it’s time to replace the alarmSlim profile design is half the depth of a standard alarmTest/silence button for efficient testing to ensure alarm is working properly