... MP3 Decoder Board(Mini audio board) Function and features:micro card reader,SD/USB MP3 Decoder Board, fm radio and ... pause, repeatProduct No.: SW-921 SpecificationsMaterial ABS board Shape oblong Control Provided LED, digital screen Voltage 5V FM frequency range 88MHz-108MHz ... : 51-100,including around 5 R&D StaffProduct Line: mini Card& USB reader speaker, portable FM radio speaker, mobile speaker, ...