Fireangel SB1-T Optical Smoke Detector including 9V Battery. The Fireangel SB1T optical Smoke Alarm features a high-performance optical sensor, test and silence button, 3 year warranty and included replaceable 9v battery. It's also certified to the latest safety standards. This optical alarm is ideal for locations including landing, hallway, bedrooms, living room and dining room. Plugs and screws included. Certified to EN 14604:2005+AC:2008 0359-CPR-00649 Smoke alarm devices DoP:SADOP-SB1-01