Features: 1. This hair massage comb incorporates microcurrent technology, effectively tightens the scalp, provides deep care for a variety of scalp problems, and promotes scalp health. 2. Equipped with 72 round teeth and 630nm wavelength red light, our massage comb can effectively knead and massage the scalp, deeply nourish the hair roots, and help you create lush and luxuriant hair. 3. Three scalp massage modes are available, which can help promote scalp microcirculation, soothe nerves, help sleep, and bring a more comfortable rest experience. 4. The 6ML large-capacity liquid guide tank and 8 roller balls design help to evenly squeeze out the hair care liquid, so that the hair growth care liquid can be introduced while massaging the scalp, nourishing the scalp and hair in all directions. Product Parameters: Material: ABS+PC+SiliconeColor (spray paint): Grey or Red Input voltage: 5V 1A Working voltage: 3.7V 0.2A Power: 5W Battery type: lithium battery Battery model: 18500 Battery capacity: 1400mAh Charging time: about 3 hours Usage time: about 2 hours and 50 minutes