This electric scalp massager comb features 72 round teeth and 630nm wavelength red light to effectively knead and massage the scalp, promoting scalp micro-circulation, soothing nerves, and helping with sleep. It has three scalp massage modes and a 6ML large-capacity liquid guide tank to evenly squeeze out hair care liquid. Made from ABS+PC+Silicone, it is powered by a lithium battery and has a charging time of about 3 hours.