Wireless Gas Detector CW-914WDetails:Operating voltage: 220V AC; Wall mounted;Alarm output: Sound&Flash alarm; Wireless transmission; Sending frequency: 433MHz/315MHz Alarm level: 10% ±5% LEL. Auto reset;High Reliability sensor;MCU processing adopted,SMT adopted,good stability,Malfunction auto-check indicator Execute criterion:GB15322;EN50194;UL1484