QNAP VS-2004L en - Manual (Page 194)

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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.
Button Description
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.