[. . . ] [. . . ] Press the CD 0 / 6 button to start playback. Listening to USB/SD mass storage device / MP3 player USB indicator WMA MP3 USB SD indicator Total number of folders Total number of tracks Open USB door Insert USB memory device Insert SD memory device 1 Press the USB/SD 0 / 6 button, and push up the USB door. Connect the USB memory device that has MP3/WMA format files on the unit. 0 To select USB or SD function, press and hold the USB/SD 0 / 6 button for more than 2 seconds. Press the TUNING/FOLDER ( 4 or 3 ) button to select desired playback folder. [. . . ] [. . . ]