Smoke Alarm With Ionization & Photoelectric Sensors, 10-year Battery

10 year smoke alarm, utilizes both ionization & photoelectric smoke sensors for optimal performance, intelligent sensing technology reduces non-emergency or nuisance alarms, powered by sealed, 10 year lithium batteries to provide continuous protection for 10 years without battery replacement, emits a loud 85 decibel alarm for ample warning, meets ul217 standards & complies with legislative requirements for 10 year battery operated smoke alarms.