Buy from Amazon.com : http://fave.co/1IhA3QG <br /><br />CP-E4 External Flash Battery Pack for Canon 600EX 580EXII 580EX 550EX MR-14EX MT-24EX<br /><br />Product Description : <br />Provides increased external power to your canon flashes <br />Reduces flash recycling time and increases the total number of flashes <br />Very suitable for using in continuous flash <br />Powered by 8xAA batteries not included <br />14 thread screw standard thread for tripod mount
