The mask is equipped with 57 LED lights, with each light having 4 colors. The different colors have different wavelengths, each serving a specific purpose. This means that a range of skin problems can be addressed to improve and restore the condition of the skin. The wavelength is given below in nm, which stands for nanometers, and indicates how deep the light can penetrate the skin. Set the automatic mode to perform a full session with all LED colors. Or you can select manual mode if you want to focus on a specific color and application.