The product has many points on the head massage, and acupuncture points for each organ or physical condition with some closely related. To achieve the promotion of blood circulation, improve metabolism, relieve pain and pressure; enhance memory; improve learning efficiency; improve sleep quality; enhance human resistance to disease and other effects. Meanwhile brain easily massage in a relaxed way, so you get the most comfortable massage pleasure and healthy fun. Size can be adjusted: Front-end device with elastic panel, fixed card, depending on the size of the first type, for targeted massage. Back-end design with slow release, easy to remove massage, acupuncture points, with senior medical latex soft. Features: Humanized design, compact, light. Outstanding health effects: relieve pain and pressure, enhance memory, improve sleep quality. Using three kinds of external power supply, use 3 AAA batteries(batteries not included). 8 kinds of massage intensity can be adjusted. Computer USB interface connection, transformer connection or batteries connection. Specifications: Item Type: Head Massager Power Type: 3 * AAA batteries(batteries not included) Material: ABS Input: 110-240V Output: DC 5V Item Size: Approx.25 * 17 * 16.5cm / 9.8 * 6.7 * 6.5in Item Weight: 443g / 15.6oz Package Size: 26.5 * 21 * 19cm / 10.4 * 8.3 * 7.5in Package Weight: 816g / 28.8oz