Dell Monitor Stand MKS14 - Manual (Page 17)

Connecting USB devices
The docking stand has five USB 3.0 ports: two ports at the rear and three
ports at the side. Use the port with USB 3.0 type B connector at the rear to
connect docking stand to the computer with the USB cable. Use the rest
of the USB 3.0 ports to connect optional external USB devices, such as
keyboard and mouse.
USB 3.0 port with supports
high current charging up to 1.5A
for BC1.2 compliant device
Connecting to a second (HDMI) display device
The docking stand can also be connected to a second external display
device through the HDMI port located on the rear panel of the docking
stand.
USB 3.0 type B
port (to computer)
USB 3.0 ports
HDMI port
Connecting audio
The docking stand can also be connected to an audio device, such as a
microphone and headphones, through the audio port.
Audio port
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Using the docking stand