Laser Scalp Massager Comb, Anti Hair Loss Head Care 3-IN-1 。New in open package. Boxes show a tiny bit of wear from multiple shipments. All have been Tested. Temporarily increases blood circulation to hair follicles. • Helps follicles receive vital nutrients necessary for more lustrous, thicker hair • Gentle massage action • 20 energy inducing 660 nanometer LED lights • 184 flexible steel bristles with comfortable ball tips • Scientifically tested technology – studies prove LED light boosts cell energy and accelerates healing • Requires 2 AA batteries