i-dop is a ‘dream’and ‘shadow' of iPod. It inherits the free and fashion style. And it is a special ‘assistant' of iPod, which has the feature of sounding through shaking. The difference between i-dop and the products of last two generations is groove which had gained Apple's license. The music player of iPod can be put on i-dop, and music will be sent out through shaking. And i-dop is a charger for iPod. When you change another groove, iPhone can be put on it.