3 wavelength laser combines 755nm 808nm 1064nm, suits for all skin tones and hair types treatment.755nm for white skin (fine/ golden hair) hair removal.808nm for yellow (natural) skin hair removal.1064nm for black skin (black hair) hair removal. FREEZING POINT PAINLESS HAIR REMOVAL HANDLEMaintain the skin surface temperature between 32~41 calm down your skin and relieve redness and swell,808nm laser has high energy,the process of hair follicle endothermic necrosis is irreversible ,and the hair removal effect is better. Diode laser technology is based on the selective dynamics of light and heat The laser goes through the skin surface to reach the root of hair follicles light can be absorbed and converted into heat damaged hair follicle tissue so that hair loss regeneration without injurysurrounding tissueSlightpain.syi