Gas Leakage Detector,Gas alarm with LED display Independent type ... , LPG,Coal Gas Sound or LED Flash alarm Gas Leakage Detector,Gas alarm with LED display (Independent)used for ... Natural Gas / LPG / Coal Gas leakage detectingCatalytic sensor, with digital LED display for concentration Operating voltage ... : 118.5*82*43mm . Execute criterion:GB15322 Gas Leakage Detector,Gas alarm