Aposonic A-S1604R20A - Manual (Page 11)

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19. ENTER Button
This button is used as
“enter” key in most circumstances. In PTZ control,
this button is used to start/stop the selected PTZ control mode.
20. (Split Windows) +/- Buttons ( )
In split-window display, press these buttons for next/previous split-window
display. In the others, press these buttons to change the contents.