Canon EOS 1D X Mark II - Manual (Page 97)

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7
Synchronizing the
Camera Time Wirelessly
You can wirelessly synchronize multiple cameras of the
same camera model when the transmitter is attached.
You can set the master camera time on up to 10 slave
cameras. Note that even after synchronization, there
will be a slight margin of error between master and
slave camera time of ±0.05 seconds, at most.
Slave camera Master camera