... CNG 3,Sound:85dB/3 meter 4,To prevent gas leaking,shut off gas source in car 5,MOQ:1pc 1: Detect ... which consists of detector and controller, when detector detects gas leakage will be passed to control signal, then controller ... that user can take prompt action to prevent accident. Gas have an advantage on Storage capacity and less pollution ... more than ±3%LEL Power: <1.5W Car gas alarm with shut-off valve