External Battery pack for Canon flash photography

External Flash Battery pack for Canon flash photography An external power source for a higher flash capacity. Protective Design----- Protectivesoft case can be worn on belt or put in a bag; light and easy to carry.The one-way connector plug is designed to avoid mis-connections whichcan lead to flash unit damage. 1/4'' Thread Screw----- Standard thread for tripod mount. Performance: (a) The Pack reduces recycling time to less than half of a normal cycleand can give up to double the amount of flashes as the original.(Depending on the condition of battery charge) (b) It is suitable for continuous flash use.(Maximum of 15 consecutive shots without break , otherwise it risks overheating) Convenience: The pack uses 8 AA batteries (same batteries as flash)and with different connecting plugs, supports Nikon SB-900 SB900 flasheto greatly increase flash capacity. It is ideal for the professional. Suitable for Canon Flashlight : 580 EXII,580 EX,550 EX,MR-14EX,MT-24EX, Dimension 71 x 171 x 27 mm Net weight: 170g Original Manufactory Package Flash battery pack x 1 Nylon protect case x 1 1/4'' Thread Screw User manual x 1