QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 196)

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(3) Alarm output
Select to activate the alarm device connected to the IP camera when an event is
triggered. The following options are available:
(i) Enter the number of second(s) the alarm device will be active when the event
is triggered.
(ii) Activate the alarm device when the event starts and stop the alarm device
when the event ends.
The option (ii) is applicable to the duration events only. A duration event is an event
with the start and end time and lasts for a period of time. It does not include the
events related to status change, such as camera disconnection or NVR recording
failure.
Click ‘Select from the list’ to select an action setting which has been configured before.