By utilizing highly heat resistance materials, re-designed optical system and interior structure of flash, the new generation professional Speedlite 600EX II-RT now achieves a 50%1 increase in the number of continuous flashes when compared to its predecessor. When using with the new Compact Battery Pack CP-E4N, the number of continuous flashes can be doubled2. It also offers a flash coverage from lens focal length 20mm to 200mm with a maximum Guide Number reaching 60 (meter; ISO 100; 200mm). A new "Charge Indicator" on LCD panel for charging status is added and the flash now comes with new accessories includind "Color Filter SCF-E3OR1", "Color Filter SCF-E3OR2" and "Bounce Adapter SBA-E3". These improvements allow a more versatile usage for professionals in flash photography.