Becareful to keep the machine off while driving , I know a fellow who had one for back pain. All was well, "he" found the setting levels which gave him some comfort at home and work while being seated. "He" decided this also would help the long drive to & from work and it did just that until something jared the setting from 3 to 10 (the max) .

I can tell you that I...err I mean "he" had to search really fast to find which pocket the contoller was located all the while driving in heavy traffice @ 70miles an hour. It isn't quite like a stun gun but darn near Better than a cup of coffee to get your heart moving in the morning