JJC Rapid Flash Fire Recycling External Flash Battery Pack for Speedlite Canon 600EX II-RT,580EX II,550EX,540EZ,430EZ, Yongnuo YN600EX-RT,YN560IV II, Nissin MG8000 Di866 Mark II for Canon as CP-E4N INCLUDES: PRO External Flash Battery Pack + Carry Case FULL POWER SOURCE: A reliable power source that allows you to create an all-in-one system for extended shooting, fast recycle rates and quick recharging. Works with 4 or 8 AA batteries (also works with Lithium and rechargeable Lithium Batteries). FAST RECYCLE TIME: Reduces flash recycling time to approximately 1/3 of the original value while the number of flashes increases approximately 3 times. COMPATIBILITIES: Canon 600EX II-RT / 600EX-RT / 580EX II / 580EX / 550EX / 540EZ / 430EZ / MR-14EX / MT-24EX etc. Replaces:CANON CP-E4