I bought this to relieve muscle tightness in my back and it did the trick, but after a few days, my mother came over, spotted it and gave it a shot. She sat there on the couch, not playing with the grandkids, and the whole time, just massaged her back. Obviously she liked it so I let her borrow it for the weekend. A few days later, she texted me saying that she uses it 3 times a day and her upper back soreness has completely gone. She's therefore keeping the massager and I should buy another one for myself. So I've just ordered another one. Guess it works!