Hold
To avoid the control buttons were presses by accident, lock it by:
~Slide the POWER Switch to HOLD position to active the lock function. " 
" will appear on the screen.
~Slide the POWER Switch to center position to release the lock, " 
" will disappear on the screen.
Volume Control
During playback, press the +/- (Volume) buttons on the front of unit or tap the volume +/- buttons on the screen to adjust the volume.
Reset
If the unit is halt or the display becomes to abnormal. Press the RESET button by a small screwdriver (not included) to reset the unit.
Main Menu
When power on the unit, the main menu will appear on the screen as below:
12