The mask contains 108 LEDs, each of which can light up in all 4 colors. The different colors have different wavelengths, each serving a specific purpose. This means that several different skin problems can be treated to improve and restore the condition of the skin. The wavelength is given below in nm, which stands for nanometers. This indicates how deep the light can penetrate the skin. Set the mask to automatic mode to perform a full session with all LED colors. Or select manual mode if you want to focus on a specific color and application.