This electric massage comb provides deep care for scalp problems and promotes scalp health. It features 72 round teeth and 630nm wavelength red light to knead and massage the scalp, deeply nourish hair roots, and help create lush hair. Three scalp massage modes are available to promote micro-circulation, soothe nerves, and improve sleep. The 6ML large-capacity liquid guide tank and 8 roller balls design help evenly distribute hair care liquid while massaging the scalp, nourishing the scalp and hair in all directions.