The wonders and benefits of using the RENPHO TENS UnitTENS units work by delivering small electrical impulses through electrodes embedded in adhesive pads to attached to a person's skin. The electric impulses target various levels of pain intensity in affected areas of the body. It can reduce the feelings of pain and soreness and prevent them from coming back in the future, which is considered highly effective in mitigating pain. If you have chronic or acute pain just trying this electric massager for relief. By placing the pads near the site of the pain, you get fast relief from the electrotherapy device, It’s non-invasive nature is an alternative to some prescription medicine. RENPHO TENS Unit offers a large LCD Display, Multiple massage Modes and 2 A-B outputs, adjustable timer, built-in lithium battery to make a total body relaxation.