Swann DVR-1590 Series Instruction Manual page 70

Glossary
Video Stream: Indicates that your DVR or NVR is recording a video
stream only.
WDR (Wide Dynamic Range): Is technology to balance out images that
have a large dynamic range. An example of this situation would be if an
indoor camera were pointing towards a window or building entrance.
The image produced by the camera during the day would be extremely
washed out due to the high brightness of the incoming light.
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