... decoder board -Single Spectrum balance display -SD &USB,FM radio -last/next song,vol,play/pause,mode -LED ... display, SD Card, USB, FM RadioFeature & function: Single Spectrum with balance display, support USB/SD, MP3, FM radio, remote control, ... R&D StaffProduct Line: mini Card& USB reader speaker, portable FM radio speaker, mobile speaker, active speaker, ... mp3 decoder board for sd, usb,fm radio,LED