... -memory function:volume,FM frequency TF card,USB,AUX Decoder Board with FM radioStrang decoder: TF card,USB,AUX MP3 Decoder Board, pcb ... +, ALARM+, and POWEROFF+.4.“MODE”: When this player works with SD card and USB flash drive together, it has such switching order ... the switching order as USB→AUX→FM→USB; When only with SD card, it has such switching order as SD→AUX→FM ...