... /Pau,repeat,mode Decoder Board with FM radio for SD card,usbFunction and features: SD/MMC/USB Card MP3 Decoder Board, pcb board ... +, ALARM+, and POWEROFF+.4.“MODE”: When this player works with SD card and USB flash drive together, it has such switching order ... has the switching order as USB→FM→USB; When only with SD card, it has such switching order as SD→FM→SD ...