Uniden GDVR 4A Series Owner's Manual page 35

6. The Live screen displays again.
Main Monitor Tab
This screen lets you determine the order in which the camera's live view
displays on the screen's sections. you can also set how long the video pauses
on each image before moving to another image (5 to 60 seconds in 5 second
intervals).
Video Blind (Masking) Tab
you can mask off up to 4 rectangular areas in a single screen. No video
records from those masked off areas; only a blank box/rectangle displays.
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