... not produce high heating, or burn the skin. It can transfer light energy into cell inner energy, accelerate circulation ... cold light (including Red, Green and Blue ) It can effectively anti-allergy and oxidized. improve dark skin, enhance skin ... Specification: Light sourceYellow,green,blue,purple,laser,these color can mix PDT lightOutput wave200-900nmFrequency1-30HzPower20J PDT LED Skin Rejuvenation ...