Canon WFT-R10A Wireless File Transmitter for EOS R5 C & R5 Mirrorless Camera - Manual (Page 18)

6.
Remove the battery magazine.
Caution
When reattaching the battery compartment cover to the camera, attach it opened to
at least 90°.
Do not touch the camera or transmitter contacts.
Caution
Using an External Microphone During Movie Shooting
If wireless functions are in use, noise may be recorded regardless of the use of the
built-in microphone or an external microphone. It is recommended that you do not
use wireless functions when shooting movies.
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