Features 1 x Digital Thermostat Temperature Alarm Controller Sensor Can select cooling or heating mode of operation. Set the highest/lowest upper limit temperature to avoid accidents. Automatically start cooling or heating for a constant temperature. Temperature calibration, you can calibrate the temperature as needed. Specifications: Material: electronic element. Voltage: DC 12V/24V/110-220V (optional). Power: 120/240/1500W (optional) Package list: Circuit connection: refer to the circuit diagram to connect power and load. At this time, the digital tube (top) shows the actual measured temperature value, and the digital tube (bottom) shows the preset temperature. If the temperature sensor is missing or damaged, the digital tube will display "- ", and the buyer must check whether the temperature sensor is installed before using it. The temperature control output is a 10A relay, which can meet various high power loads. Please make sure the circuit is correct. Indicator light, digital tube status: Indicator light: off means the relay is disconnected and on 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 refrigeration mode The relay in protection mode is automatically disconnected. Use of the keys: the thermostat panel has three keys, keys + buttons - set keys. +key: fast accumulation of values Key -: to achieve rapid decline in value Press Restart: restart the button Package List