Canon EOS-1 D X Mark II Instruction Manual page 39

Using a Genuine Interface Cable (sold separately)
Clamp
Connecting interface cable without using the cable protector may
damage the digital terminal.
Do not use a USB 2.0 cable equipped with a Micro-B plug. It may
damage the camera's digital terminal.
As shown in the lower-right illustration for step 4, check that the interface
cable is securely attached to the digital terminal.
To connect the camera to a TV set, using HDMI Cable HTC-100 (sold
separately) is recommended. Using the cable protector is also
recommended when connecting an HDMI cable.
If you use a genuine interface cable (sold
separately, p.485), run the cable through
the clamp before attaching the clamp to the
cable protector.
Nomenclature
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