Battery-powered smoke alarm that sends a fast powerful alert with loud alarm when smoke is detected. Features test/hush button and enhanced sensing technology to reduce the risk of false alarms. Battery safeguard makes it difficult to fit without battery in the unit. Easy installation with included twist-and-click mounting bracket. Standalone 9V Battery Supplied 85dBA Alarm at 3m Test/Hush Button Loud Alarm Sends Powerful Alerts Reduced Nuisance Alarms Battery Safeguard Easy to Install Suitable for Use in Hallways, Landings, Bedrooms, Living Rooms & Dining Rooms Standalone 9V Battery Supplied 85dBA Alarm at 3m Test/Hush Button Loud Alarm Sends Powerful Alerts Reduced Nuisance Alarms Battery Safeguard Easy to Install Suitable for Use in Hallways, Landings, Bedrooms, Living Rooms & Dining Rooms