A thin layer of gel (similar to ultrasound gel) is applied to your skin before treatment, to ensure the maximum amount of light enters the skin. The Ellipse applicator is pressed against the skin and a carefully controlled pulse of visible light is released. Potentially harmful wavelengths and wavelengths that only heat up water in the skin are removed using patented Ellipse Dual Mode Filtering. The remaining light is absorbed by pigment (melanin) in your hair. Melanin converts the light into heat, which travels down the hair and heats the hair matrix, preventing future hair growth.