Fire smoke alarm Fire smoke alarm, universal ideal for all areas: houses, shops, hotels, restaurants, office buildings, schools, banks, libraries, computer houses and warehouses, etc. Alerts and warns people to stay away from dangerous places if smoke is detected. The detector adopts special structural design and ASIC, which has the characteristics of dustproof, mothproof, and anti-interference of external light, etc. Alarm Test Button Easy to install photoelectric sensor for early detection from all directions Specifications: Product name: smoke alarm • Power supply: 9V battery / DC12V (Not Included) • Working current: The electrostatic current is less than 10uA, and the alarm working current is between 10-30mA; • Output form: dry contact, output open circuit when alarming, short circuit output when alarming, impedance less than 50 ohms; • Working environment: -5? -50?, 10-90% non-condensing; • Buzzer volume intensity: 85 dB at 10 inches. • Install a smoke detector every 20-30 square meters in the room, and install a smoke detector 0.5-2.5 meters above important equipment. • Round size, diameter 102mm, height 31mm Package Contents: 1 x Smoke Alarm 2 x screws