TENS machines are used right across the world by health professionals and sports professionals. They are certified medical devices and accepted by mainstream medicine as a pain relief device.
Most of our customers have never heard of a TENS machine. I was the same until I bought one and tried it. I was astounded there was a machine available (and has been available for over 50 years) that could not only relieve the pain in my back but has aided in virtually complete recovery. I have gone on to use it on my knee, my hand, my arm, my foot, stress relief and for just plain old pleasure. And, I have seen so many people achieve similar results. My family uses them and my friends and extended family too.