Increase blood circulation to the scalp,promoting relaxation,releasing stress and relieving sore. Dry and wet dual purpose,IPX7 grade of waterproof, you can enjoy comfortable scalp massage while bathing,ralaxing yourself thoroughly with 4-modes tension like a physical therapist. One button operation,easy to use.Enjoy a perfect massage anywhere without an annoying wire.Relieve tension from your office,home or even your car.