... gas valve 3,Alarm,security HOT!Home use gas detector with shut off valve Features:Adopts nanotechnology sensor with ... talkback system and tri-meters reading transmission). High stability, long working lifeWall mount, elegant appearance, low power consumptionAfter alarm ... gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm rangegas: 0.1~0.5%; natural gas ...