A TENS unit muscle stimulator and TENS machine provides pain relief, acts as a muscle massager or shoulder massager, provides carpal tunnel relief, and acts as a muscle relaxer (great for muscle recovery). An over-the-counter favorite back pain relief device providing immediate and lasting drug-free muscle pain relief from back pain, neck pain, tennis elbow, and bursitis. A favorite TENS device among medical professionals for delivering drug-free back pain relief as well as treating common ailments like neck pain, carpal tunnel relief, arthritis, shoulder, knee, elbow, leg and foot pain. The machine comes with multiple TENS therapy modes that will provide instant muscle pain relief. The Professional Strength TENS Unit provides TENS therapy and is a muscle stimulator, nerve stimulator, and leader in sciatica pain relief devices.