Electrical Muscle Stimulator XFT-502 is a dual channels, battery-operated, low frequency therapeutic massager. It can be used to relieve pain in shoulders, back, waist, legs, hands, foots and other part of the body. As it is very small, people can put it in the pocket and do the massage not only at home, but also in office or on trip. Functions include Relieve pain in shoulders, back, waist and other parts of body, Soothe anaesthetization and reduce fatigue, Improve the blood circulation, Exercise the muscles, relieve muscle pain, and Increase fiber contraction. Features include Gold-hand adopts the profound Chinese traditional medical theory, Dual channels, 2 electrode wires, 4 electrode pads, and Battery operated, small, handheld, can be put in the pocket.