Dual-color LED display: The dual-color LED display of this digital thermostat control module can simultaneously display measured temperature (red) and set temperature (blue). It can be used in cooling/heating mode, and you can test indoor or outdoor temperature. Waterproof design: NTC (10K 0.5%) probe is waterproof, you can control temperature at any time, and you can also control heating or cooling according to different needs. Reliable use: The electronic temperature control switch module has been tested for consistency and reliability, with a control accuracy of 0.1 degrees Celsius, a space accuracy of 0.1 degrees Celsius, and high temperature protection Wide range of applications: electronic thermostats can be widely used in smart homes and industrial equipment, suitable for household appliances, automatic irrigation, office machines, audio, cars, aquariums, fish tanks, etc. size:48 x 29 x 32 mm Material:ABS+electronic components colour:Black Package Contents: 2 x Temperature monitoring controllers Only above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.