Features Temperature calibration, you can calibrate the temperature according to your requirement. Set the highest/lowest temperature limit to avoid accidents. Automatically start cooling or heating for a constant temperature. Can select the working mode cooling or heating. High quality. Specifications: Material: electronic elements. Voltage: DC 12V/24V/110-220V (optional) Power: 120/240/1500 W (optional). Weight: approx. 48 g / 1.7 ounces. Package list: 1 x Digital Thermostat Temperature Alarm Controller Sensor Circuit connection: see wiring diagram for connecting the power supply and load. At this time, the digital tube (top) shows the actual measured temperature value and the digital tube (bottom) the preset temperature. If the temperature sensor is missing or damaged, the digital tube displays "-- --" and the buyer must check whether the temperature sensor is installed before use. The temperature control output is a 10A relay that can handle various high performance loads. Please make sure the circuit is correct. Indicator Light, Digital Tube Status: Indicator light: off means the relay is disconnected, and one means the relay is closed Digital tube: display "-- --", 1. Check if the temperature sensor is missing or damaged 2. High temperature protection of heating mode. 3. Low temperature protection in cooling mode. The relay in protection mode is automatically disconnected. Use of the buttons: the thermostat panel has three buttons, buttons + buttons - set buttons Button + : fast accumulation of values. Key - to achieve the rapid decline of value. Press Reboot: restart the button Package List