Monoprice 6660 8-channel Security DVR - Manual (Page 26)

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Installation and user manual
2. Recording
[ Global ]
Watermark
Generally this should be set to on, this allows the supplied software to verify the downloaded
information to ensure it has not been tampered with or changed.
HDD Overwrite
Generally this should be set to on to ensure that the DVR does not stop recording when the
hard drives are full.
Audio
Enable each audio channel for global recording.
Pre-Alarm Duration
This is the time for which the DVR will buffer recordings, to use as pre-alarm events, It can