... Board(Mini audio board) Function and features:micro card reader,SD/USB MP3 Decoder Board, fm radio and digital screen ... songs, next songs, volume control, Play/pause, repeatProduct No.: SW-921 SpecificationsMaterial ABS board Shape oblong Control Provided LED, digital ... 100,including around 5 R&D StaffProduct Line: mini Card& USB reader speaker, portable FM radio speaker, mobile speaker, active speaker ...