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radio frequency is one kind of high frequency electromagnetic wave, it can penetrate the dermis and subcutaneous tissue through the fat layer, take heat into deep skin and then accelerate regeneration and reconstruction of skin deep-tissue. rf can produce energy by impedance from the skin, which can make the fatty layer temperature increase in very short time, and this heat will also act on collagen in the dermis layer. so as to achieve the effect of skin pulling, pigmentation improvement, skin whitening, and wrinkle removal.