NEUROTRAC MULTI TENS AND MUSCLE STIMFEATURES Digital Dual channel TENS and NMS device for Pain Relief and muscles rehabilitation. Run 2 programmes at once: Ability to run two different TENS programmes at the same time, which allows you to run a combination of high and low frequency pain relief treatments on two areas at the same time. For example, you can use channel 1 to release pain relieving endorphins in the area of where the pain occurs. At the same time, use channel 2 for