I was bought my first Trion Z as a gift. I didn't think it would work.... however!!....within 24 hours of wearing it the repetitive strain injury in both my wrists, lower arms and hands had gone. Completely gone. It really is amazing. My last bracelet wore out and broke so I had to go without for a week. Went swimming as usual but had terrible back pain for a few days. My new Trion Z Active Bracelet arrived and the pain stopped. I really won't be without one and have bought many as gifts including for elderly parents who also have seen marked improvements in arthritis and general joint movement. Highly recommended!!