... decoder board -MIni audio board sd usd MP3 Decoder Board with FM radio (Mini audio board)MP3 decoder board, SD, USB/ ... mobile/MP3 player decoder board, with FM radio, LED power display, support remote control, ectKey function: last ... Ordinary audio combination, Car audio, multimedia speaker, subwoofer, amplifier, electronic products and so on.-Key function: last songs, next songs ...