The Sony FA-EBA1 External Battery Pack is a power source. This battery pack helps reduce flash recycle time of 0.6 seconds, as well as provides up to 660 flashes per session. It uses a battery magazine system with up to eight AA alkaline or NiMH batteries. 

Compatible With:
Sony HVL-F60RM Flash
Sony HVL-F60RM II Flash
Sony HVL-F60M Flash

In the box:

• Sony FA-EBA1 External Battery Pack
• AA Battery Magazine
• Protective Pouch
• Limited 1-Year Warranty

Dimensions: 3 1/8 × 6 7/8 × 29/32 inches (77 x 174 x 23 mm)