AK-200FC/ H4 Product Description: 1. Model: AK-200FC/ H4 2. Manual testing and reset function. 3. working environment: Humidity: f97% RH Temperature: 0 -60 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 )