QNAP VS-2004L en - Manual (Page 106)

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4. Select the data search mode.
Date and time search (Text entry)
i. Select the NVR server(s) and the IP camera(s)*.
ii. Click the ‘Text entry’ tab.
iii. Select the recording type, the start and end time when the video is recorded.
iv. Click ‘Preview’ to preview the video.
v. Click ‘OK’.
* Maximum 16 IP cameras can be selected. The IP cameras to which you are denied
to access will be shown in grey.