If you' own a tenge unit you can save yourself a lot of money. All they do Is put these electrodes on your feet and you wait 30 minutes and then they take him off. That is all that they do for the big bucks they charge. I paid shy of $7,000 and hate to admit I was a fool and was suckered in. Nothing changed with my painful feet and legs after 30 plus sessions. I drove over 150 miles three times a week for no results.