Coolerguys Programmable Thermal Fan Controller with LED Display This thermal control unit allows complete control over the tNOT COMPATIBLE WITH ANY LITE KITS or 5v FANS emperature at which 12v devices plugged through it will turn on and off Features: 24" Thermal Probe (optional 48" and 72" probes available) 4 3pin connectors 4pin Molex pass through connector 4 Segment LED Display Option to switch between Fahrenheit and Celsius Display Fully Programmable from 32-211F (0-100C) (On temperature must be at least 2F/1C above turn off temperature) Can handle up to 2A worth of devices Works with all 12v devices from fans to lights Size: Device: 71mm x 40mm x 17mm Cutout: 68mm x 37mm This unit does require a power supply that has both 12v and 5v power lines, it presently works with computer power supplies and our Model #840556029977 2A AC-DC adapter Instructions: Start: Press once and the start up temperature will blink, use the right Up/Down buttons to set the temperature (note: it must be at least 2F/1C higher than the turn off temperature) press Start button again to return to the real time readout. Stop: Press once and the turn off temperature will blink, use the right Up/Down buttons to set the temperature (note: it must be at least 2F/1C lower than the turn on temperature) press the stop button again to return to the real time readout. C/F or Up: Will change display to and from Fahrenheit and Celsius or will increase the temperature when in the Start or Stop programming mode. Down: Will decrease the temperature when in the Start or Stop programming mode. Not tested at extreme temperatures