... 1.DC9~16V 2.Network smoke detector 3.EN14604,UL268 2-wire Network Photoelectric Smoke detector .MCU processing adoptedDescription and Main functions ... .Stainless steel shield,Anti-RFI;SMT adopted,high stability. 3.Dustproof,mothproof and anti-light interference design. 4.MCU ... .Stainless steel shield,Anti-RFI;SMT adopted,high stability.3.Dustproof,mothproof and anti-light interference design.4.MCU ...