The Canon Compact Battery Pack Cp-E4N is an essential accessory for professional photographers, designed to significantly enhance flash recycle times and increase the number of continuous flashes. This external battery pack is equipped to take the optional Cpm-E4 rapid-change Battery Magazine, which can be loaded with 8 Aa-size batteries, ensuring you're always ready to capture the perfect shot. One of the standout features of the Cp-E4N is its quieter operation during recharging, a detail that makes a big difference in maintaining a discreet presence during events or shoots. This compact battery pack is not only efficient but also slim and portable, making it easy to carry around. It even comes with a belt holster for added convenience.The Cp-E4N is compatible with a range of Canon Speedlite flashes, including the Speedlite 600EX Ii-rt, Speedlite 600EX Rt, Speedlite 580EX, Speedlite 580EX Ii, Speedlite 550EX, Speedlite 540EZ, Speedlite 430EZ, Speedlite Mt-24EX, and Speedlite Mr-14EX.