Nextar Q4 Owner's Manual page 15

General Setup
Screen
in the settings menu, the screen will display as below:
Tap
This item is used to calibrate the sensitivity of the touch screen. Tap the center of "+" as it
moves around the screen. If you touch the center of "+" every time, it will disappear after
having moved through a cycle (center→top left corner→bottom left corner→bottom right
corner→top right corner). Tap the screen to return to the settings menu.
Note: If "+" doesn't disappear, you should calibrate again.
Volume
Tap in the settings menu to enter Volume settings menu for volume adjusting, as
shown below:
Tap the buttons to adjust the volume. Then tap to confirm or tap to
cancel.
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