QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 110)

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iv. Specify the time range when the files are recorded.
v. Specify the number of minutes (1-30) to play the video recorded before and after
the event.
vi. Event search. Use this function to search for all the events occurred on the IP
cameras. Refer to the event details to search for the recording data.

Search all: Search for the specified events occurred on all the IP cameras of an
NVR within the time range specified.

Search: Search for the specified events occurred on one IP camera within the
time range specified.