The diode laser device uses 3 wavelengths of 755nm 808nm 1064nm, which has special effectiveness for melanocytes of the hair follicles without any damage to the surrounding tissues. The laser can be absorbed by melanocytes of hair follicles and converted into heat to increase the temperature of the hair follicle. When the temperature rises that can irreversibly destroy the structure of the hair follicle, the hair follicle structure will disappear, thereby achieving the purpose of removing hair permanently.