HOT!Home use gas detector with shut off valve 1,ISO9001&CE 2,In the ... 3,Alarm,security HOT!Home use gas detector with shut off valve Features:Adopts nanotechnology sensor with self-design patented technology, low ... detectedcoal gas ,natural gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm rangegas: 0.1~0.5%; natural ...