QNAP VS-2004L en - Manual (Page 68)

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Login IP 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. (This function can also be enabled by right
clicking the monitoring channel.)
Press and hold the left mouse button to zoom in or press and
hold the right mouse button to zoom out. Press the left
mouse button to drag the viewing angle of the IP camera.
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:
View the 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.