AMAZING! MUST BUY!! I am so glad that I found this device. I purchased one for myself and used it for my back aches. After one use (one minute), I felt it worked. I've been using it on and off for different parts of my body. Since I type a lot, I started to feel pain in my wrist so I started to use it on my wrist and within minutes, the pain is gone. I then bought one for my mother for mother's day and I'm happy to report that she says it works for her arthritis. She is also a satisfied customer.