... disk MP3 play -2.LINE OUT function, direct drive earphone Mini Speaker SD cards, U-disk,AUX 3 modes Features: 1. ... the SD card or U-disk is not inserted, the player will turn into FM mode. Play order of SD ... LINE mode insert the SD card or U-disk, the player will automatically turn into the MP3 mode, for which ... NEXT to raise the volume, volume level 0-30 Mini Speaker SD cards, U-disk,AUX 3 modes