... of epithelium and regulate physiological function. It is a kind of health care appliance which characterizes high ... models, i.e. YH-T, YH-D, YH-S. YH-D is a floor type with single head, ... YH-S a floor type with double heads and YH-T a desktop type. Model YH- ... continuous analgesia. promote growth, development, reproduction and repair, a high efficacy, quick, without pain, use widely, without ...