Most fire victims die at night in their own four walls. It is not so much the fire that is dangerous, but the smoke. Smoke alarms save lives - the loud signal tone warns you of the risk of fire in good time, even when you are asleep, and gives you the necessary head start to get yourself and your family to safety. Photoelectric detector.H-AL 13000 includes 1x 3V CR123A lithium battery (10 years), non-replaceable.Low battery warning tone.Visual indicator (red) of the test function with test button for function testing.Suitable for wall or ceiling mounting.Safety clip (prevents mounting without battery).Height approx. 37 mm, diameter 100 mm.Mounting material included.IP20: for indoor use.