QNAP VS-2004L en - Manual (Page 130)

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3. Select the detection mode: motion detection, foreign object, missing object, out of
focus, or camera occlusion. Multiple options can be selected.
4. Adjust the sensitivity for object detection.
5. Adjust the time interval for detecting the foreign objects and missing objects. If a
foreign object appears or a missing object disappears for a period of time which is
longer than the time interval, the NVR will record an event.
Note: The interval slide bar appears only when ‘foreign object’ or ‘missing object’ is
selected.