Amazon.com: AODELAN External Flash Battery Pack Battery Power Bank for Canon 600EX II-RT, 600EX-RT, 580EX 580EX II, 550EX,MR-14EX,MR -24EX .Yongnuo & Godox Speedlite Replace CP-E4N & CP-E4 (12 AA Batteries) : Cell
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Jeff Cable's Blog: The Canon 600EX-RT Flash System - A real-world test
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Amazon.com : YONGNUO Updated YN600EX-RT II Wireless Flash Speedlite with Optical Master and TTL HSS for Canon AS Canon 600EX-RT w/EACHSHOT Diffuser : Electronics
Faster strobe: Canon Speedlite 600EX II-RT by Jose Antunes - ProVideo Coalition
Vello Bounce Dome Diffuser for Canon Speedlite 600EX-RT