Clarion VX402E Owner's Manual page 41

Settings Operations
Monitor Off
Touch Monitor Off button on main menu, it will
show "Monitor off......Touch the screen to return"
and then the head unit will turn off the TFT
screen. Touch any place of the screen, the TFT
screen will turn on again.
Audio Off
Touch Audio Off button on main menu to turn on/
off the audio of source (Except Navigation).
Clock mode
Touch system time on main menu to show clock
mode.
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VX402E/VZ402E