Micro SD USB card reader,FM -Mini audio board -SD/ USB card reader ,FM radio -ABS,oblong -MP3 decoder board with AUX line in ... MP3 Decoder Board, fm radio and digital screen display, with AUX line inremote control, and so on. -Key function: last songs, next ... speaker, subwoofer, amplifier, electronic products and so on.-Key function: last songs, next songs, volume control, Play/pause, repeatOEM & ODM ...