Nextar Q3 Owner's Manual page 17

Calibrate
Tap in the settings menu to calibrate, the screen will display as below:
This item is used to calibrate the sensitivity of the unit. Tap the center of "+" as it moves
around the screen. If you touch the center of "+" every time, it will disappear and tap the
screen to return to the settings menu.
Note: If "+" doesn't disappear, you should rectify 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
General Setup
to confirm or tap
17
to cancel.