low frequency massager tens unit 1. clean meridian 2. enhance blood ... improve metabolism 4. relieve fatigue low frequency massager tens unit ----body healthcare massager (8 modes,2massage pad,LCD ... less time for body exercise. they feel pain the on neck , back, but sometime they dont know ... shoudler, waist, back, arms, legs and so on. help to stimulation circulation and clearing the blockaged or ...