Inserting the small-sized MP3 prayer of iPod Shuffle and the like, in the headband of attachment, if you can utilize, to do the marathon while with, to do the sport where the movement is extreme while with, it can enjoy music with bone conduction!
Because sound is heard with bone conduction, because sound outside is not cut off, feeling at rest, you can hear music even with the marathon on the road and the like!

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