Power supply: 3 × AAA batteries (not included); Computer interface USB connector; Transformer connection.
Size can be adjusted: front device with elastic panel, fixed card, according to the size of the first type, for targeted massage.
The use of methods and means: it will be directly installed in the head acupressure point massage on the amount in front of both ends of this elastic adjustment in the back of the head, that is, to the front hood, no hood in the head. Then move the switch, adjust the massage intensity (1-8 kinds of intensity can be adjusted). According to their needs, turn off the power at any time after use, directly to the head massager can be removed.