Description Can select cooling or heating operation mode. Set the lowest/lowest upper limit to prevent accidents. Automatically start cooling or heating for constant temperature. Temperature calibration, you can calibrate the temperature as needed. High temperature alarm, when the measured temperature reaches the setting temperature, the controller will alarm. Specification: Temperature range: -55-120. Control temperature accuracy: 0.1. Display color: red and blue. Supply voltage: 12V. Data backup: yes. Relay: 20A. Dimensions: 79*43*26mm. Hole size: 74*39MM. Note: There may be a little color distortion due to different computer resolutions. Errors in size may occur due to different computer resolutions. Package includes: 1 x Digital Temperature Controller 1 x Temperature Sensor