I don't have it anymore but it was, at the time, 20+ years ago, the best model made by Medtronics. I'd bet that the tech has been further improved and an orthopedic or physical therapist could suggest one. What was odd was that sometimes a certain setting (say, a constant linear pulsing at medium intensity) would perfectly offsetting pre-spasm twitches and, at other times, completely different settings helped most. My orthopedic surgeon sent me to a physician/acupuncturist to show me how to use it as there were different variable to play with. It truly helped ease the fear of the fear of pain in that I didn't feel so helpless.