1. Using environment-friendly refrigerant, the refrigeration performance is stable; 2. Temperature control precision control range is small (±1°C); 3. lt has dual independent temperature control mode to meet the cooling temperature requirements of laser and laser cutting lenses; 4. With water flow alarm, ultra-high temperature and ultra-low temperature and sensor fault alarm functions; 5. lt has the function of compressor overcurrent and overload protection to extend the service life of the compressor.