SincereetaliFeatures: High and low temperature display, three-view window. Power-off memory function. Start high temperature cooling mode: Set the start temperature value and the stop temperature value, the relay closes, and the cooling equipment starts working when the temperature is tested at the initial temperature. The relay disconnects and the cooling equipment stops working when the temperature is detected the stop temperature. For example: Set the start temperature to 30 , and set it to 25 , when the tested temperature is 30 , close the relay and turn on the start indicator light (red). When the tested temperature is 25 , the relay disconnects and the stop indicator light (green) is on. Low temperature start, heating mode: Set the start temperature stop temperature, when detecting the temperature start temperature the relay closes and the heating equipment starts working. When detecting the temperature stop temperature, the relay is disconnected and the heating equipment stops working. For example: Set the start temperature to 25, stop temperature to 30, when detecting the temperature 25, close the relay and the start indicator light (red) is on. When detecting the temperature 30, the relay disconnects and the stop indicator light (green) is on. Specifications: Item Type: Temperature Controller Model: 1401 Style Selection: 12V, 24V (Optional) Temperature Measuring Range: -9~99 Temperature Measuring Accuracy: 1 Temperature Control Accuracy: 1 Refresh Rate: 0.5s Input Voltage: DC-12V/24V Environmental Requirement: -10~60 / Humidity 20%-85% Measuring Input: NTC (3950-10K 1%) Waterproof Sensor Output Type: Relay Output Display Mode: Digital Readout Package Weight: 37g Package Size: 78 * 51 * 2.5mm / 3.07 * 2 * 0.09in Package List: 1 * Temperature Controller