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A kind of special speaker, but there is no sound device inside. It depends on a high-technical crystal to shake any hard surface, like wood, glass, wall, stone and so on, and make hard surface send out the music.
There are two types--- without MP3 & with MP3
It has power switch and pause control.Volume and songs switch are controlled by the ear.
Standard config: English gift box, I-jerry Adapter(USA standard with two pins) Audio wire USB wire English-Chinese version instruction
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