First Alert Slim Photoelectric Smoke Alarm with 10-Year Sealed Battery, PR710, WhiteBrand: FIRST ALERT Color: WHITE Features: Complies with all current 10 year legislation in U. S. states cities where required Slim shape is half as thick as a standard smoke alarm; easy twist lock mounting system and tamper resistant design Equipped with photoelectric smoke sensor optimized to detect larger smoke particles produced by smoldering fires; helps minimize the number of false alarms Patented smoke entry system allows for a direct path to