By the combined use of ultrasonic vibration generated by a pair of
ultrasonic vibrators that are alternately driven asynchronously with the
heartbeat, and stereo music vibration waves generated by a pair of music
vibrators, the brain is gently and effectively provided with massage
without subjecting the head to excessive massage. Blood flow can be
stimulated deep within the brain. As the rise and fall of the vibration
energy generated by the ultrasonic vibrators are mitigated by the
modulators, impact applied by the vibration to the head of the wearer is
reduced.