When connected with the Bluetooth enabled
phone and playing the music from the USB drive,
the screen displaying.
When adjusting the volume, the screen displaying
the recent volume.
When adjusting the song number, the screen
displaying the recent song number.
When adjusting the FM channel, the screen
displaying the recent frequency.
When pausing the music, the screen displaying.
When adjusting the EQ mode, the screen displaying
the recent EQ mode.
When adjusting the Circulation mode, the screen
displaying the recent circulation mode.
When change to another folder, the screen displaying
the recent folder number.
