R&D,decoder board,FM -Single Spectrum balance display -SD ... Key:last/next song,vol,play/pause,mode -LED display R&D, universal mp3 decoder boardSingle Spectrum with balance display, ... Brief Introduction Founded: 2000Total Staff: 51-100,including around 5 R&D StaffProduct Line: mini Card& USB reader speaker, portable ... any problems, please feel free to contact with us. R&D,mp3 decoder board with FM radio