Linked Shooting - Canon Wireless File Transmitter WFT-E7A Instruction Manual

Linked Shooting

With linked shooting, up to 10 slave cameras can be linked in a wireless
network to the master camera on which you will release the shutter.
Note that there will be a slight delay after you release the master camera
shutter until the slave camera shutters are released. Movie shooting is not
supported.
Slave camera
Master camera
69