Dell S3221QS User Manual page 13

7 DisplayPort 1.2
8 Audio line out port
9 USB 3.0 upstream
port
10 USB 3.0 downstream
ports
11 USB 3.0 downstream
with BC 1.2 charging
12 Built-in left speaker
*Audio line out port does not support headphones.
Connect to your computer using a DisplayPort
cable (purchased separately).
Connect to an external speaker or a sub-woofer
(purchased separately).*
Connect the USB cable from this port to your
computer to enable the USB ports on your
monitor.
Connect your USB peripherals such as storage
devices and printers.
NOTE: To use this port, you must
connect the USB upstream cable
(shipped with your monitor) between
the monitor and the computer.
USB 3.0 downstream port with charging
capability. Connect to charge your USB device.
NOTE: To use this port, you must
connect the USB upstream cable
(shipped with your monitor) between
the monitor and the computer.
Provides audio output.
About your monitor │ 13