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. This drug-free option for pain relief is available without a prescription and may help manage your pain in as little as 15 minutes. OMRON the pain relief experts for over 20 years gives you personalized control of this powerful portable TENS unit.The Pocket Pain Pro uses comfortable self-adhesive Long Life Pads that can be used up to 150 times. Unit - One-Year Limited Warranty; Pads are warranted for thirty days.