... CNG *To prevent gas leaking,shut off gas source in car *Sound:85dB/3 meter *2 years warranty 1: ... Detect propane, butane, methane,LPG: Widely used in Car, Garage 2: Master conncected Max. 3 sensors Comfort equipment ... though gas alarm YK series of Car gas alarm is described intelligent alarm which consists of ... is not more than ±3%LEL Power: <1.5W Car Gas Leakage Sensor