High-performance power pack for speedlites dual output for powering two flashes simultaneously greatly increases times of flashes reduces recycle time and improves working duration. Ideal and A MUST for event wedding and location photography! Features: Enormous Power Large-capacity lithium battery offer up to 1800 full power pops per charge 3-hours charging time Quick Recycling With PB960 it takes only 1s to charge Canon 580EX Nikon SB900 and Sony F58AM at the maximum power Strong Compatibility Compatible with on-camera flashes from Canon Nikon Sony and Godox etc using optional cables Special Power Supply Dual output design for powering two flashes simultaneously not reducing the recycling speed Battery chamber is replaceable and removable. Double your flashes with a spare battery chamber LED Display Concise LED display panel tells remaining battery level and working status and reminds of low battery level and overheat Great Portability Slim compact and lightweight design built-in belt clip and comfortable shoulder strap included Chart of Compatible PB820 Flash Cables (NOT include): PB-Cx (CANON): for Cannon 430EZ 540EZ 550EX Cannon 580EX 580EX II and other flash model with same type of input power port PB-Nx (NIKON): for Nikon SB28 EURO SB28DXSB80DX SB800SB900 and other flash model with same type of input power port PB-Sx (SONY): for Sony HVL-F58AM and other flash model with same type of input power port PB-Mx (METZ): for Metz 58 AF-1 58 AF-2(C/N/OP/P/S) and other flash model with same type of input power port