TENS 7000 2nd Edition Digital Muscle Nerve Stimulator Therapy with AccessoriesProduct Description Over 1,000,000 TENS units sold and a consumer OTC favorite in physical therapy equipment The TENS 7000 is a muscle stimulator and muscle recovery device that provides prescription strength pain relief and is the best valued OTC digital TENS unit on the market today. Energized by a 9Volt battery, this TENS machine is proven to be powerful and durable. The TENS 7000 unit is the preferred device of physical therapists and physicians