High quality!Natural gas leak detector ... Alarm,securi High quality!Natural gas leak detector with shut-off valve Features:Adopts nanotechnology sensor with ... building talkback system and tri-meters reading transmission). High stability, long working lifeWall mount, elegant appearance, ... natural gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm rangegas: 0.1~ ...