1. Use environment-friendly refrigerant, and the refrigeration performance is stable; 2.Temperature control precision control range is small (± 0.3 °C); 3. Two temperature control modes are available to meet the selection requirements of customers' equipment in different environments; 4. With water flow alarm, ultra-high temperature and ultra-low temperature and sensor fault alarm functions; 5. lt has the function of compressor over-current and overload protection to extend the service life of the compressor.