The thermostat module has a MCU controller, a sensor input, keys, LED display and a relay. It can be reprogrammed for control, timing, or counting.Heating: Startup Temperature Less than Desired Temperature; Cooling: Startup Temperature more than the Desired Temperature. Range from -50 Celsius to 110 Celsius. Temperature control precision is 0.1 Celsius.3-digit display with high brightness, highly recognizable and easily control equipment and devices.With 30CM NTC10K waterproof probe is equipped for convenient usage. The NTC probe is allows to control the temperature even of fluids, allowing the controlled heated or cooling.The Clear case for thermostat module can be fixed in the acrylic case perfectly and be protected in a good condition. You can see the digital display of the screen directly and clearly and it will not affect your operation of the button.colour:greenmaterial:plasticsize:48x40x14mmPackage Contents:4 x Temperature Controller Module4 x Plastic CaseOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.