... pcb -memory function:FM,volume -Max vol:26 -last/next songs,vol,Pla/Pau,repeat,mode Decoder Board with ... FM radio for SD card,usbFunction and features: SD/MMC/USB ... subwoofer, amplifier, electronic products and so on.-Key function: last songs, next songs, volume control, Play/pause, repeat, ... this button. Decoder Board with FM radio for SD card,usb