Features:
A good external power source for flashes.
Suitable for continuous flash use (Maximum of 15 consecutive shots without break or risk of overheating).
Ensuring a stable power supply for the flashes.
Can reduce recycling time to less than half of a normal cycle and can give up to double the amount of flashes as the original (Depending on state of battery charge).
Protective soft case can be hold on belt or put in a bag; light and easy to carry.
The one-way connector plug is designed to avoid mis-connections which can lead to flash unit damage.
1/4" Standard thread for tripod mount.
Support Nikon flashlight: SB900.
Uses 8 * AA size batteries (same batteries as flash) prior to a shoot to ensure fast and smooth A good replacement of Nikon SD-9A battery pack

Specifications:
Power: 8 * AA batteries (Not included)
Output Voltage: 12V
Color: Black
Item Dimensions: 15.8 * 6.9 * 2.5cm
Item Weight: 144g
Package Size: 18.3 * 9.7 * 6.2cm
Package Weight: 233g

Package including:
1 * Flash Battery Pack
1 * Screw
1 * Case
1 * User Manual