The 10 Year Photoelectric Smoke Alarm features the latest in compact smoke chamber technology, which helps reduce the potential of nuisance alarms caused by household dust or insects. The alarm is ideal to be installed in bedrooms, living areas and hallways. The alarm features a built-in 3v 10-year lithium battery, easily accessible large test and hush button, 9 minute hush time, a visual indicator for operation and alarm mode, is easy to install, AS3786:2014 certified & RTA Compliant.