QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 163)

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 Events:
The events supported by the NVR are classified as camera events (motion detection,
alarm input, camera disconnection), NVR events (recording failure), and external
events (user-defined events).
Note: The camera events available depend on the features supported by the IP
cameras or video servers.
Buttons on the event list
Add an external event. This button is not applicable to the camera events and
the NVR events.
Edit an event. This button cannot be used to edit camera disconnection.
Delete an external event. This button is not applicable to the camera events
and the NVR events.