QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 65)

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Login network camera homepage:
Select a channel and click this button to go to the homepage of
the selected IP camera.
Event notification:
When the alarm recording is enabled and an event is detected,
this icon will be shown. Click this icon to view the alert
details.
Digital zoom:
Select a channel and click this button to enable the digital
zoom function. (You can also right click the monitoring
channel to enable this function.)
Press and hold the left mouse button to zoom in or press and
hold the right mouse button to zoom out. You can press the
left mouse button to drag the viewing angle of the IP camera.
You can also use the mouse wheel or the PTZ control panel to
use the digital zoom function.
Focus control:
Adjust the focus control of the PTZ camera.
Select PTZ camera preset positions:
You can view different preset positions of the IP camera by
clicking the number buttons. To configure the preset
positions of the IP camera, please refer to the user manual of
the IP camera.
Recording storage status:
Display the percentage of the used storage and the free space
of the NVR.