QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 88)

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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’.
* You can select 4 IP cameras at maximum.