Enjoy the full benefit of both Laser and LED therapy for both Hair and Scalp! Living cells thrive in light and your hair is no different. The end result is that the appearance of your hair will improve and you will feel good about your hair again. Thirty Six 660 LED stimulators, using technology developed by NASA, massage and stimulate the scalp with light emitting diodes. Then the HairPRO Laser Brush features a wide beam 890 cold laser transmitter. This allows the laser to transmit the entire length of the brush, for full scalp penetration. With this dual action technology your hair will be fuller and more vibrant than ever before!