Radio frequency is mainly aimed at dermis to stimulate the regeneration of collagen in muscle bottom. EMS current is mainly aimed at muscle stimulation to achieve the effect of tightening at the same time. If the function is strong or RF, there is also a blue-red light, and the main red light plays a role in balancing skin color and has a certain effect on acne marks. It is better to buy a lovely red light and RF at the same time.