... 3,Alarm,securi High quality!Natural gas leak detector with shut-off valve Features:Adopts nanotechnology sensor with self-design patented technology, low ... consumptionAfter alarm situation eliminate, renew automatically.Parameters: Gas detectedcoal gas ,natural gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm rangegas: 0 ...