1. It adopts microprogramming controller which has Text character operation interface and the system is able to be chosen manually or automatic operational mode.2. It constantly monitors the temperature and humidity of the indoor & outdoor environment. It can realize linkage with air conditioner of equipment room by intelligent controller.3. The system supports late start-up function and LCD Chinese character display. The operation is simple and convenient. Parameter is able to be set up. 4. It adopts RS485 interface which supports telemetry, remote signaling and remote control.5. Low noise, good dustproof and high energy-saving effect.6. There is air supply and air exhaust device which has functions of insect prevention, water prevention and burglary prevention. No reverse current.7. It has the function of fault warning, low temperature and high temperature warning.