The Canon Speedlite 600EX-RT introduced integrated radio triggering to the Canon Speedlite family (using another compatible speedlite or trigger on camera). There's also an expanded zoom range of 20-200mm, increased maximum output and improved reliability.
Check out the Canon ST-E3-RT if you need a radio trigger for use with this flash that offers automatic exposure and high speed sync.
The following items are included when you hire the Canon Speedlite 600EX-RT:
Learn more about the Canon Speedlite 600EX-RT on the official product page.