The External Flash Battery Pack is an external power source for a higher flash capacity.  Reduces recycle by more than half.  This high performance power pack is a light, compact external power source for use with all Canon flashes. This is a must have for event photography, such as weddings.

SPECIFICATIONs:
Power: 6x AA type battery (Not included)
Dimensions: 69(W) x 158(H) x 25(D) mm
Weight (without batteries): 170g

Battery Type - Alkaline-manganese
Number of Flashes (Approx.) 250 Times | Recycle Time (Approx.) 0.2-5 sec.

Battery Type - Ni-MH Rechargeable
Number of Flashes (Approx.) 200 Times | Recycle Time (Approx.)0.2-4 sec.

Battery Type - Lithium
Number of Flashes (Approx.) 700 Times | Recycle Time (Approx.)0.2-7 sec.

Support to Use:
     Canon flash light---580EXII,580EX,550EX,MR-14EX,MT-24EX
     Nikon flash light---SB-11,SB-20,SB-22,SB-24,SB-25,SB-26,SB-27,SB-28,SB-28DX,SB-8-DX,SB800,SB-900
     Sony flash light---HVL-F56AM,HVL-F58AM