Compaq TFT500 User Manual page 5

The base of the monitor also has four Universal Serial Bus
(USB) connectors. Three of these connectors, 1, 2, and 3, are
for connecting USB compatible plug and play devices such as a
keyboard, mouse, or video camera. USB connector 4 is used to
connect the USB signal cable to the computer.
Mounting the Display on a Swing Arm
A swing arm mount with tilt and rotation capability can be
purchased separately to use with this monitor. Refer to your
authorized Compaq dealer or reseller for more information on
this.
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