... arbitrarily choose:FB: 1, buttons on a curve2, under a key FF3, a folder button FOL +4, a folder button FOL -5, buttons on ... RANDOM button: RANDOM broadcast (+ / - 8 FILE folders),11, buttons DEV_CHG: USB/SD card conversion12, REPEAT key REPEAT looping key: according to ... the current broadcast within the folder songs.Specifications:Will host a Usb modules to your MP3 or amplifier, the speakers use this ...