The principle of the RF-301 rf Microneedling crystallite Machine is the combination of "micro-needle penetration + radiofrequency energy." The mechanical stimulation of micro-needles, along with the thermal stimulation of radiofrequency, collectively triggers the skin's self-repair system, promoting metabolism, improving microcirculation, inducing collagen contraction and degeneration, initiating the regeneration and reorganization of collagen proteins, and ultimately repairing, reshaping, and tightening the skin.