Finally, the Hybrid is one smoke alarm that can be hardwired, battery-powered, interconnected or stand-alone – no need to purchase separate alarms for different installs. The built-in 10-year battery can be the primary power source or the backup power source when installed using the 240V hardwired option. Use emerald’s Hybrid Smoke Alarm as a stand-alone alarm or interconnected – either wirelessly with the addition of the RF module (sold separately) or hardwired connection. The alarm is fitted with a test/hush button to facilitate testing of the alarm. The hush function also allows the alarm and alarm system to be silenced in the case of a triggered alarm. Network RF compatibility with the Vulcan 240V, Ranger RF and the emerald Smoke Alarm Controller.