The MEDVIVE MV950 Tens Unit provides a natural method of activating endorphins and stimulating the muscle to give you a natural pain regulator. You don’t have to worry about the possible side-effects that come with using drugs for pain relief. Not only does the large animated LCD screen with backlight make it easy to read and understand even in the dark, but this tens unit comes with a clear user’s manual, making the device quick and easy to set up.