Features: This is a DC 12 V digital temperature controller. It can control the power of the refrigerator to prevent it from becoming very cold, and it can also control the power of the glass container to prevent overheating and maintain a stable environment. The controller has heating and cooling modes and temperature alarm function Simplified Design:Easy to set. Support Fahrenheit display One Relays Output:Switch between heating mode and refrigeration mode according to the device you plug into the controller Safe Protection:High and low temperature alarms are available when the temperature overshoots your desired temperature. Compressor delay protection time setting and Temperature calibration Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description:Controller power supply: DC 12 V Temperature unit: Fahrenheit temperature, measuring range: 4100°C Temperature measurement resolution: 0.1 Accuracy: ±0.5 Working mode: heating or cooling mode Many temperature control ranges: 2 - 25 cm maximum use temperature is closed Control resolution: 1 deviation between the lowest operating temperature Power consumption: less than 3 W Relays contact capacity: 10 A / 250vac, 10 A / 110VAC Data retention: yes Compressor delay protection: Yes Product size: 8.5 x 7.5 * 3.5 cm/3.4 * 3 * 1.4 inches Sensor connection cable length: 3 M / 3 m Package List: 1x Temperature Controller