1.seven frequency, LDE direct
2.support document format such as MP3 , WMA and so on .
3.have special audio input hole.
4.can use earphone to listen music directly.]
5.can play MP3 directly .
6.can keep FLASH inside, from 128,256,512,1GB to 2GB.
7.have frequency and music memory function.
8.adopt PLL to lock annular circuit , release stably
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