PowerFX wristbands promote both physical, and mental health, because of the Frequency Technology, and Negatively charged Ion's loaded on the holographic disc embedded in the band itself. Studies have shown the band help's with a number of issues including, but limited too. Blood flow, Ache's and Pain's, Sleeplessness, Joint Pain, Concentration, Anyone that has had a major surgery it has been known to help with pain. I personally use this product, and it has taken the pain out of joints in my knee's when I run. I am now back running at full strength again, and my sleep has been very deep as well. I wake up feeling refreshed every day.