I recently had a Tens unit delivered to my home prescribed to me by my orthopedic Doctor for pain from an injury from a fall a few years back. It is amazing how well it works. So much of our bodies aches and pains are due to muscle tension that throws everything out of whack. I would highly recommend looking into getting one if you have chronic pain issues. You can even buy them online without a prescription for a very frugal price if your medical insurance does not cover one. In the few days I have had mine I have felt a big difference in my shoulders and neck. Make 2015 a pain free year.