SR-812DC-2 is 2-Wire Network Photoelectric smoke & heat alarm Main features: 1.Power supply non-polar input 2.Infrared photoelectric sensor 3.MCU processing, eliminate false alarm 4. Network LED indicating alarm 5.SMT manufacturer technology, high stability 6.Dustproof, mothproof, anti-light interference design 7.Stainless steel shield in the chamber, anti-RFI(20V/m-1GHz) 8.Execute criterion: GB4715,EN54-7, UL539