I-View Digi-4800XP 16 channels Hybrid Embedded DVR - Manual (Page 45)

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3-1-7. Adjust Volume Control
Please click the icon on the system control panel screen to adjust the system volume.
3-1-7. Saving System Information
To make the change effectively after modifying each DVR system configurations, user need to press
the “Save System Setting” ( ) icon to complete the changes.
Fig. 3-1-6.1 Adjust Volume Control