Canon EOS-1D X Mark III Advanced User's Manual page 44

Using the Cable Protector
When connecting the camera to a computer, use the included interface cable or a Canon
cable.
When connecting an interface cable, also use the included cable protector. Using the
cable protector helps prevent accidental disconnection and terminal damage.
Using the included interface cable and a Canon HDMI cable (sold
separately)
1.
(1) Cable protector
(2) Clamp
2.
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