1. Model: AK-200FC/H4 2. Manual testing and reset function. 3. working environment: Humidity: less than 97%RH Temperature: 0 degrees Celsius-60 degrees Celsius 4. Dimensions: 120mm*70mm*45mm 5. Working voltage: 220VAC /110VAC, 12VDC-20VDC 6. Additional function: can work with solenoid valve or manipulator or exhaust fan (optional) 7. Networking: wired networking (NO, NC) 8. Wireless networking mode: 315MHZ/433MHZ (2262 OR 1527) 9. Alarm concentration: coal gas: 0.1%~0.5% natural gas: 0.1%~1% LPG: 0.1%~0.5% 10. Patent No.: 200830104030.2 11. Automatic error-detecting function (The red and green lights shine alternatively )