... 3)SD/MMC CARD controller(4)One route AUX input (5)USB flash disk and SD card ... is 72*35.5mm1,SD input slot2,AUX input slot 3,Either External power input or remote receiving window, but ... USB flash disks and SD cards transform each other, AUX input, FM . Lasting press for 3 secondsRemote controller function1 ... USB flash disks and SD cards transform each other, AUX input, FM .2, PREV,Previous one in FM ...