Canon EOS R5 Mark II Advanced User's Manual page 349

3.
Record the movie.
Press the movie shooting button to start recording a movie. You can
also start recording a movie by tapping [ ] on the screen.
While the movie is being recorded, [ REC] (1) is displayed, the
screen is outlined in red, and the tally lamp is lit.
Sound is recorded by the microphone (2).
To stop recording the movie, press the movie shooting button again.
You can also stop recording a movie by tapping [ ] on the screen.
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