C1211 has 2 NTC probe input for temperature measurement and 1 relay output to control heating or cooling.

Case: 75x38x70mm ABS
Mounting Hole: 71x29mm
Ambient Temperature: -20-55C
Humidity: 10-90% no condensing
Display: 2-digits LED
Power: 220VAC/50Hz
Temperature Range: -40-60C(-40-140F)
Sensor:  2NTC
Resolution: 1
Function: Display/Compressor control/Time defrost/Temperature defrost/Manually defrosting
Relay Output:: Relay for compressor    16A.
Sensor length: Standard 2.0m(Optional)