The OMRON Pocket Pain Pro® TENS device (PM400) is a simple but powerful, drug-free solution for relief of chronic, acute* and arthritic pain. It is a small, portable, easy-to-use, drug-free solution for achy, stiff or sore muscles and joint pain. Pocket Pain Pro is designed to reduce and relieve pain, stiffness and numbness in multiple pain areas including the lower back, arms, legs, shoulders and feet by applying electrical nerve stimulation to the surface of the skin near the site of the pain....