Godox Flash Power Pack PB-960 Black with Cable for Canon 600EX, 580EX, 580EXII, 540EZ, 550EZ and other flash Model: PB960  Suitable for: Canon 600EX, 580EX, 580EXII, 540EZ, 550EZ and other flash model with the same type of input power port Quick Recycling: Takes only 1s to Canon 580EXII, Nikon SB900 and others at the maximum power Dual Output: Separately powering two flashes at the same time without reducing recycling speed Full Power Flashes: Approx. 1800  Flash Charging Time: Approx. 1s (full power) PB960 dual output power pack adds a power output port so as to providing power to two flashes at the same time. Powerful battery helps improve working duration, greatly increase flash times and reduce recycling time. Perfect for photojournalism, event, sports, wedding and location photography, shooting never interrupted !