Working principle: When the thermostat works normally, the digital tube displays the current temperature measurement value. In the cooling mode, when the measured temperature is or equal to the temperature setting value + the temperature difference setting value, it enters the cooling state. In the heating mode, when the measured temperature is less than or equal to the temperature setting value-the temperature difference setting value, it enters the heating state. Description: 1. Small and exquisite appearance 2. Easy to use 3. Wide application scenarios The main parameters: Product name: DC mini thermostat Power supply voltage: DC5~24V Instructions: When the thermostat is working normally, short the power button to turn off the thermostat. When the thermostat is off, short the power button again to turn on the thermostat. In the normal display state, you can increase or decrease the target temperature by long pressing or short pressing the increase key and the decrease key. The target temperature is 30°C by default, and the adjustment range is -10°C~120°C. and hold the power button for more than 3 seconds to enter the menu options. Then short the power button to enter the currently displayed menu, and short the increase or decrease keys to set the parameters. After the setting is completed, short the power button to return to the menu options, and short the increase or decrease keys to select the menu. If you need to restore the parameter to the default value, and hold the increase key and the decrease key at the same time during normal display. Material:plastic colour:Black Package Contents: 4 x Mini thermostat Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.