... Gas Detector / Alarm Accessory JD-MD-2000RFeatures:Adopts nanotechnology sensor with self-design patented technology, low false alarm.Network signal: ... signal to start up the fans.Fit for using together with many low voltage control system (burglar alarms, building ... gas ,natural gas ,LPG(liquefied petroleum gas)SensorNew Nanotechnology sensor, super long working lifeAlarm rangegas: 0.1~0.5%; ...