Canon Wireless File Transmitter WFT-E4 II A - Manual (Page 65)

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Linked Shooting
With linked shooting, up to 10 slave cameras can be linked in a wireless
network (via IEEE 802.11g in ad hoc mode) to the master camera on which
you will release the shutter. Any cameras compatible with linked shooting,
when they have WFT series transmitters attached, can be used as slave
cameras, regardless of model.
Note that there will be a slight delay after you release the master camera
shutter before the slave cameras shoot. Movie shooting is not supported.
Master camera
Slave camera
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