VIEWSONIC VG2456V 23.8" Conferencing Monitor - Manual (Page 31)

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Speaker Mute
Press the 3 key to mute/unmute the Speaker.
Microphone Mute
Press the 4 key to mute/unmute the Microphone.
Main Settings
Press the 5 key to decrease/increase the Volume level, adjust the LED Fill Light, and
enter the On-Screen Display (OSD) Menu.
Volume Down
Volume Up
LED Fill Light
Main Menu
Exit