It's just a fancy shmancy foot massager. It just has massaging zones so I bet it has a bunch of small vibrator motors and heating coils controlled by a small CPU.
It's probably a pretty good foot massager too, but they could have just called it that (like "Worlds Best Foot Massager" or something) instead of surrounding it with wank.
Unless...they mentioned something about "electrode pads" so if those are conductive and it actually shocks your feet...HELL NO
Worlds Worst Foot Massager!