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Canon TTL Hot Shoe Adapter 3 - TTL Multiple Flash Off-Camera Hot Shoe Adapter
For use with Connecting Cords 60 and 300. Slides in to any EOS accessory shoe and controls up to four off camera speedlights. Required on-camera for wired TTL w/ more than one Flash or longer cord length than 2 ft. (Not compatible with E-TTL or E-TTL II. No automatic flash with EOS Digital SLRs). Not compatible with EOS Digital SLRs.
Amazon.com Product Description
When placed in a Canon EOS accessory shoe, the Canon TTL Hot Shoe Adapter 3 allows the control of up to four off-camera Speedlite flashes. The control of multiple flashes increases flash versatility, resulting in better lighting of photos.