Wireless Flash Photography - Canon EOS 600D Instruction Manual

The camera's built-in flash can work as a master unit
with Canon Speedlites having a wireless slave feature
and wirelessly trigger the Speedlite(s) to fire.
Canceling the slave unit's auto power off
To cancel the slave unit's auto power off, press the
camera's <A> button. If you are using manual flash
firing, press the slave unit's test firing (PILOT) button to
cancel the auto power off.
Be sure to also read the explanations about wireless flash
photography in the Speedlite's instruction manual.
Wireless Flash
Photography
You can use the built-in flash
for wireless flash shooting.
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