... In the house and close the gas valve 3,Alarm,security Good quality!Natural gas detector with shut off valve Features:Adopts ... alarm situation eliminate, renew automatically.Parameters: Gas detectedcoal gas ,natural gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm ... rangegas: 0.1~0.5%; natural gas :0.1~0.3%; LPG:0.1~0.5 ...