Usage Tips:STC-1000HX temperature controller features cooling and heating modes with automatic switch, temperature unit switch between Celsius and Fahrenheit, temperature control by set-point and differential, temperature calibration, cooling output protection delay, sensor fault alarm and other functions. The controller reserves an interface of RS-485 communication function for further connection to an Elitech IoT module which makes remote control available. DIY Design Use Wiring Diagram, A more economical and practical choice. Stable and Reliable, Flame retardant ABS for plastic shell Up to V0 level, Passed EMC anti-interference test. Alarm and Parameter Setting - Audible and visual alarms when temperature exceeds temperature limit or when sensor error occurs. Allow to set parameters: temperature calibration, Refrigerating control output delay protection, Celsius display, It will save set parameter when the power is off. Temperature Range:-55℉-248℉ Sensor Probe:2m Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:Plastic Package Contents: 1 * Temperature controller Only the above package content, other products are not included. Note: Light reflection 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.