This device emits sound waves beyond the range of human hearing. These waves readily penetrate the body, stimulating and massaging the cells and tissues below the skin in such a way as to generate heat and increase circulation. In addition, the waves allow herbal substances impregnated into the coupling gel to pass through the skin and directly work their healing actions on damaged tissues. It is particularly useful in combination with acupuncture, as it reinforces the healing energy directed to an injured or weakened area.