Most fire victims have accidents at night in their own homes. The danger is not so much the fire itself, but the smoke. Smoke detectors save lives – the loud alarm alerts you in time about fire hazards, even while you sleep, giving you the necessary lead time to get yourself and your family to safety. Photoelectric detector H-AL 9000 including 9V block battery. Alarm sound for low battery status. Optical display (red) for the test function with a test button for functionality checks. Suitable for wall or ceiling mounting. Safety clip prevents installation without a battery. Height approximately 37 mm, diameter 100 mm. Includes mounting materials. IP20: for indoor use.