Vonnic VVRHD1620M 16CH HD-SDI 1080P High Resolution DVR (Hard Drive Not Included) - Manual (Page 55)

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2. Otherwise, the video and time stamp over video can’t be properly playback and displayed on
Window Media Player™.
9-6-2. NSF Format - HD Player
NSF format: NSF format video can be played back using the HDplayer that the DVR copies to
“DvrPlayer” folder on USB flash drive with video. Use the mouse scroll to use digital zoom in and out
feature.