1.  Principle of hair removal: Utilize the selective absorption characteristics of melanin in the hair shaft to light energy. After absorbing light energy, melanin will convert it into heat energy. This heat energy will gradually be transmitted along the hair shaft to the isthmus and bulge of the hair follicle, and then accurately destroy the blood vessels at the hair papilla of the hair follicle, causing the blood vessels to shrink due to heat and lose the ability to provide nutrition to the hair follicle, ultimately achieving the effect of effective hair removal.

2.  Principle of freckle removal: When intense pulsed light of a specific wavelength acts on the skin, it will be selectively absorbed by the melanin in the affected tissue. After absorbing light energy, the melanin converts it into heat energy. Through the photothermal effect, the subcutaneous melanin undergoes thermal coagulation, causing its color to deepen and expand and float to the surface of the skin. Then, with the metabolism of the skin, scabs will form and fall off naturally, and the spots will disappear.