Canon Speedlite 600EX II-RT Price: $425.00 (as of 17/10/2021 12:44 PST- Details) & FREE Shipping.

Improved performance of continuous flash by approx. 1.1 to 1.5x* for fast firing (up to 2.0x* if used with optional Compact Battery Pack CP-E4N).
Wireless flash shooting support is available for both radio and optical transmission, offering users greater functional range when using a flash.
Multiple flash system allows control of up to five groups of flashes;Approx. 100-700 flashes.