stand-alone work,wireless work,net-worked. FeaturesDetect LPG/LNG leakage.Intelligent MCU control, low power consumptionVisual light and audio alarm, capable of switching off electromagnetism valve.Installed on the wall, home use onlySpecificationsAlarm level: LPG: 0.10.5, LNG: 0.11Power supply220V/50Hz, 110V/60HzOperating condition: temperature: -15+50 relative humidity≤93Alarm volume≥ ...