The photoelectrical ABUS smoke detector reacts to smoke particles. If too much smoke enters its measuring chamber, a loud alarm signal is triggered. The smoke detector is mounted at the ceiling in the center of a room. The minimum distance to the walls should be 15 cm, the distance to the corners at least 50 cm. The operation range of the smoke detector is up to 40 m². We recommend installing one smoke detector each in the hall, the stairways, living room, and bedroom. In the event of fire, the integrated powerful piezo sounder provides an effective alarming – at a minimum sound level of 85 dB. When using a 9 V alkaline battery block, the lifetime is up to 3 years (service interval for battery replacement). The battery lifetime varies depending on how often you run the detector's function test. This is done easily by pressing the function test button. It is recommended to test the detector once a week. The detector registers low battery and then issues regular beep tones. The home smoke detector is VdS certified. This guarantees high safety standards.