Dual Relay Digital Thermostat, one for Heating or Cooling, another for alarm (You can connect it to indicator light or other alarm devices.)Power supply: 10A/220VAC (250V Max.); Product Size: 75 (L) x 34.5 (W) x 85 (H) mm You can set the Min and Max temperature values; Overheating Alarm and Sensor ErrorTemperature Measuring Range: -50 - 99C; Choice of C / F Temperature display; 2m probe (IP67) Compressor Delay Protection; Temperature Calibration; Easy to use; Used in swimming pool, aquarium, terrarium, etc. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, it There will be some color difference, the actual item received shall prevail. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store