QNAP Security VioStor NVR (Version: 4.1.1) - Manual (Page 73)

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Note:
 Click the event notification icon to view the event details, enable or disable the alert
sound or clear the event logs.
Manual recording:
Enable or disable manual recording on the selected channel.
The administrator can enable or disable this option on the
system configuration page.
Audio (optional):
Turn on/off the audio support for the monitoring page. For
more information about the compatibility of this feature,
please visit
http://www.qnap.com/NVR/CompatibilityX01.html .
Two-way audio (optional):
Turn on/off the two-way audio support for the monitoring
page. For more information about the compatibility of this
feature, please visit
http://www.qnap.com/NVR/CompatibilityX01.html .
Snapshot:
Take a snapshot on the selected channel. When the picture is
shown, right click the picture to save it to the computer.