j5 create JUA210 - USB 2.0 VGA Display Adapter - Manual (Page 53)

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Off
When Off selected, it will disable
the display of the USB Display
Adapter.
Identify Monitor
When Identify Monitors is
selected, a serial number will be
shown at the upper right corner of
attached display device.
It helps you to know the serial
number of each display, when
using Hotkey function.