Electric Head Massager Alleviates Brain Fatigue Head Massage Instrument Multifunctional Massage Physiotherapy Instrument Feature Three kinds of external power supply are adopted Power supply mode: install three No. 7 batteries, computer USB interface connection and transformer connection. {size adjustable} The front end is equipped with an elastic device {fixed clamping plate}, and targeted massage is carried out according to the head types of different sizes. 8 kinds of massage strength can be adjusted. The back end adopts a release design to facilitate the removal of the massager, {usage and method} Put the massager directly on the head {the one with more acupoint massage points is in the front, and with elastic adjustment is in the back of the head, that is, with cover is in the front, and without cover is in the back of the head} Then toggle the to adjust the massage (1-8 kinds can be adjusted). You can turn off the power at any time according to your own needs. {users} over 12 years old PACKAGE INCLUDES: 1pc Head massage instrument