R&D,decoder board,FM -Single Spectrum balance display -SD &USB,FM radio -Key:last/next song,vol,play/pause,mode ... display, SD Card, USB, FM RadioFeature & function: Single Spectrum with balance display, support USB/SD, MP3, FM radio, remote control, with left ... Unit Size 87*66.5mmSpecificationsVoltage 5v FM frequency range 88MHZ-108mhz Function MP3 player + FM radio Remote control 1Another typeR&D, Bi ...