ViewEra V191HV User Manual
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3.2.1 Audio menu
Press “1” to get the OSD, press UP or DOWN to move the highlight to Audio menu, and then press “1” to enter
Audio adjustment, which is done by pressing UP or DOWN.
1) Volume
a. Press UP or DOWN to increase or decrease the volume of the built-in speakers. Then press “1” to confirm the
adjustment and back to Audio menu.