I Purchased this machine on a prescription from my doctor after a car accident. It worked wonders. I use it 3 to 4 times a day and my therapist says it has made a big difference in my mobility. I fall asleep every time, it is so relaxing. I have and would recommend this machine to anyone with any body pain IT REALLY WORKS!. I use mine on my whole left side, neck, shoulders, back, thighs, legs, and feet.