Features: The real-time temperature display is easy to control, the temperature sensor error is small, and the use for time is long. Switch between hot and cold modes, and support hot and cold modes at the same for time. The temperature is controlled by setting the temperature and differential value. Support temperature calibration, power-off memory, state memory, delay start and other functions. Built-in alarm function, when the detected temperature is higher than the set value, the screen will flash to give an alarm. Widely used in aquariums, freezers, fish for tank farming, fruit preservation, zoos, chicken boxes. Package Includes: 1x LED Digital Thermostat Specifications: Material: Abs Working Voltage: Ac220v Temperature Range: -40~99C Ambient Humidity: 20-85% Control Output: Relay Output, Higher Than 10A Size: Approx. 76.5x62x34mm/3.01x2.44x1.34inch note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.