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As a professional power supply product, this product is designed to charge speedlites with external power input ports(such as flash products form Canon, Nikon, Sony, Nissin, Yongnuo etc.) and provides power supply for continuous lights. This item only takes one moment to charge Canon flashes (such as Canon 580EX II, 580EX, 430EZ, 540EZ, 550EX and other flash model with the same type of input power port) at the maximum power, and 250-320 times of flashes in full brightness is supported, which greatly improve your shooting efficiency and reduce working time. As well, the product offers versatile compatibility, so that you can charge flashes and other products of different brands simply by replacing the plug-in connector cable.