The Neewer PB 960is a powerful, well-built and light-weight battery pack, perfect for the demanding photographer who wants reliable power for their Canon, Nikon, or Sony flash. PB960 not only reduces the recycling time to 1 second at full power, it allows you to fire up to 1800 full power flashes with a 580EX II or Nikon SB-900 on one charge.The package comes with ONE wall charger that is 110-240V compatible. Press the On/Off button and the battery will display the battery level via 4 green LED lights. There are also the Status and Battery indicator LED lights that provide information about the battery during charge and use, such as blinking lights on the Battery indicator warns an overheating battery.Enormous Power 4500mAh Large-capacity lithium battery, up to 1800 flashes per charge at full power for Canon 580EX and Nikon SB900Quick Recycling With PB960, it takes only 1s to charge Canon 580EX, Nikon SB900, and Sony F58AM at the max power. Only 3 hours" charging time is needed.Strong Compatibility Compatible with camera flashes from Canon, Nikon, Sony, Metz, Nissin, Quantum, and Godox, etc. only need to change the connecting cable (for this item, only included one connecting cable for Canon, Compatible with Canon 600EX,580EX,YONGNUO YN560/YN560III/YN560EX and other flash model with same type of input power port)Dual Output Separately powering two flashes at the same time without reducing recycling speedReplaceable Battery Battery chamber replaceable, more flashes with spare units, shooting never interruptedLED Power Capacity Indicator Press the button, you can see clearly for the power capacity with the 4 led light (4 light-Full; 1 light-Low)Package contents:1X NEEWER PB 960 POWER FOR FLASH