R&D,mp3 decoder board -Single Spectrum balance display -SD &USB,FM radio -last/next ... LED display R&D, universal mp3 decoder boardSingle Spectrum with balance display, SD Card, USB, FM RadioFeature & function: ... Single Spectrum with balance display, support USB/SD, MP3, FM radio, remote control ... contact with us. R&D,mp3 decoder board for sd, usb,fm radio,LED