I purchased a Tens unit after breaking both ankles within 2 months of each other. My doctor wanted me to pay $1,000 for a "medical grade" tens unit. I was sure I could find something more affordable. I paid $25 for my Gurin Tens Unit and it has worked wonders. I also use it on other areas such as wrists and back and it helps with pain relief. Very happy with the effectiveness and the price point.