A few years ago i was in an accident and went to therapy for my knee. They used electrodes for my pain and when I got done, the pain was gone! I figured i try this out since I been exercising and working out with heavy weights. It relieves the pain after 10 minutes on high intensity! Its a great product to have after high intensity workout or after a long day to relieve foot pain ect. It also comes with a great guide for the placement of the pads! This is my 2nd day of using it and im impressed!