Main feature1. Easy installation and maintenance
2. High adaptability to the ambient,with dustproof,mothproof,moisture proof and anti-white light function
3,This is 2 wire type
(4 wire please click here!)4. DC 9-35V wide voltage operating range
5. Power supply non-polarized input
6. Twin LED for 360 degree visual
7. Flashing LED power indicater
8. Metal shield, anti-electromagnetic interference
9. Two-year limited warranty
10. Suit for detect the smoke in house, shop, hotel, restaurant, office building, school etc...