... Dustproof,mothproof,anti-light interference Relay output 4-wire photoelectric smoke alarm,smoke detector(network)Power supply non-polar input:DC9V~35V Stainless ... and anti-light interference design. MCU processing adopted,eliminate false alarm. Relay output/LED indicator. Automatic reset and power-off ... .06%/ft Dimension: Φ104*49mm . Execute criterion:GB4715including bracket smoke alarm,smoke detector