I got this for my other half. He has crumbling discs in his back and arthritis in his legs, due to a lifetime of riding motorbikes. The pain always was at it's worse in the afternoon, and he was popping codeine and other painkillers that weren't doing anything. The reason for the late review is because it said to ask your doctor if you have heart problems, which he has. So he went to his GP and she said it would be fine. Since he has been using this, his pain has gone. To be able to use something for a while that can give you a few hours of relief is a godsend. He's over the moon with it. When you have chronic pain it really brings your mood down, but since using this he is more relaxed. To know that if your pain is bad you can attach this TENS machine for a while and get some relief from it is brilliant. I would definitely recommend it for people with chronic pain who would give anything to have it go away for a few hours. I wish I had got him it years ago.