... controlling 2.High quality 3.LED display Main Function1.Temperature display, temperature controlling2.refrigeration/heat mode can be set3.Compressor start ... Fan delay start (controlling by both temperature and time ),fan delay stopTechnique Index 1,Temperature display range: -50~150°C( ... 50Hz (Refer to the wiring diagram)3,Operating environment: temperature -20°C~50°C, humidity≤85%4,Relay contact ...