Smoke Detector Fire Alarm Detector Independent Smoke Alarm Sensor For Home Office Security Photoelectric Smoke AlarmThe test button will blink every few minutes which is a normal symbol of working condition.Usually 40 seconds flashes onceIf alarm can not stop, maybe a labyrinth on the alarm loose，put it down a little bit.,How to test, Battery installed first ,second press the button test, and then use the smoke test.Please ensure that the smoke concentration reaches a certain concentration and then test, otherwise it will not alarm.its suitable for use, under normal circumstances there is a place to stay with smoke；Large dust, water vapor, steam, oil mist pollution, corrosive gases；places with relative humidity> 95% and ventilation speed> 5m / s.This smoke detector detects the smoke to make sure everyone is awakened and alerted in case of a fire emergency.The detector is suitable for detecting the smoke in home, room, shop, hotel, restaurant, office, school, bank, library, computer house, storehouse and etc. Easy to install. Photoelectric sensor for early detection from all directions.