Mini Speaker SD cards, U-disk,AUX ... play -2.LINE OUT function, direct drive earphone Mini Speaker SD cards, U-disk,AUX 3 modes ... MODE” key are invalid. Press M key to switch into the FM mode, LCD displaying current frequency point ... save the stations. Short press PLAY/PAUSE to switch among the stations.Short press PRE to decrease ... the volume, volume level 0-30 Mini Speaker SD cards, U-disk,AUX 3 modes