TriThera Hair Brush. Benefits: Dual massage with multi-channel microcurrent massage,relaxes the scalp and relieves fatigue. Even liquid dispensing as rollers evenly discharge liquid,use with or without oil. Scalp care with 6 beams of 650nm red light,effectively activates hair follicles,strengthens hair,and prevents hair loss. Features: 9 massage combinations with 3 levels of EMS and 3 levels of kneading massage. IPX7 shower-friendly,suitable for both dry and wet use. Easy to clean,the liquid storage tank can be disassembled for convenient cleaning. Key Notes: Long battery life willl last 7 days on one charge(average use once per day),fully charge in 2 hours. Lightweight and portable,wireless,less than 300g,compact, and easy to carry.