... house and close the gas valve 3,Alarm,securi High quality!Natural gas leak detector with shut-off valve Features ... , building talkback system and tri-meters reading transmission). High stability, long working lifeWall mount, elegant appearance, low power consumptionAfter ... gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm rangegas: 0.1~0.5%; natural gas ...