Ensure your home's safety with the Kidde 4" Optical Smoke Alarm. This entry-level device features a reliable 9V battery with a 5-year life. Equipped with a test/hush button, it provides easy testing and reduces false alarms. Ideal for smoke detection, it's a dependable choice for any household. Features and Benefits Battery operated - 9V battery supplied as standard Hush button allows nuisance alarms to be temporarily silenced Test Button allows regular testing of smoke alarm function Typical Applications Can be used in most locations throughout the home, in particular in bedrooms and living areas Standards EN14604