I'm 62 yo. I have tendinitis and arthritis in both hands. My puppy was receiving cold laser therapy on her knees for $50 per treatment. I decided to find a different way to treat her. I found the Tendlite on Amazon (gotta love Amazon Prime). I began using it on Angel (she wasn't too keen on the treatments) so I started using on myself. Next week she is having double knee surgery. I am sure I'll be able to lift and carry her in the weeks to come with less pain. Tendlite is not a cure for what ails me, but I use it daily. IT HELPS! I can bring it to work, use it while I watch TV and sometimes I can sneak a treatment on my puppy when she sleeps on my lap. Best of all, I it's rechargeable . With the.money I spent on treatments at the vet I could have bought 2 Tendlite. I'm glad I took a chance on this purchase.