... oblong -MP3 decoder board with AUX line in SD USB Card reader,universal MP3 Decoder Board(Mini audio board ... ) Function and features:micro card reader,SD/USB MP3 Decoder Board, fm ... 100,including around 5 R&D StaffProduct Line: mini Card& USB reader speaker, portable FM radio speaker, mobile ... you order, the better price you will get. 3) If you have any problems, please feel free ...