A waste money,painful,too expensive. Only lasted for 6mo. The wires hurt,I was left with nerve pain.
Try Concha Nacar, found on Amazon. I have been using it off and on for my knees and elbows and it really work. It will work for under arms and between the thighs also.
I use Concha Nacar, it really work on the elbows, knees and knuckles. You can order it from Amazon. I usually order the 6 pack.