Stellar product. You have to give it time for a complete therapy solution. Healing properties are believed by this user as tendon on inside of knee was once so painful, I wanted my leg severed! Drove to a physical therapy sports medicine officer where they use cold laser. I was so excited and so in pain. They had me fill out the paperwork and knowing I was in great throbbing pain, the receptionist proceeded to "SCHEDULE" an appointment for weeks later. She obviously didn't get it. I drove home and ordered my Tendlite and couldn't wait for it to arrive. I was pleased when it arrived only days later. I read the directions and began treatments. Charges well, last for numerous treatments. Superior quality through and through. End device and charger are highly engineered. This is not a flashlight. Treatment is quick lasting only a minute per spot. I usually did three key tender points. In about three weeks, pain was all gone and it's been several months now with no treatments or pain. Love having this at my ready should I need a next round. At 6' 5" 290 lbs then, my knees are fine, but sometimes the supporting mechanisms get stressed. Now 245 lbs as part of my conscience effort to improve my health/agility, I Highly Recommend this product. Steve William Laible, Captain, USAF (Ret)