This is a desktop expression pedal. These are special edition prototypes, made in preparation of a larger run (featuring the UFO and the split skull).
They are TRS (require stereo cable) and have a B100k potentiometer which works well with EQD, Strymon, EHX, Matthews Effects, and more. It will not work well with Boss, Eventide, or Line 6. Please check with your pedal's manual or manufacturer for compatibility before purchasing.
White these are all 100k, the production run will also have 10k variations which work with Boss pedals.
DO NOT USE YOUR FEET ON THESE.