High Speed Charging- Power Pack PS300 provides high speed charging Approx. 0.7 seconds to recharge Di 866 flash. Economic- The battery life of 1 Ni-MH battery cluster -7.2V3300 m Ah can provide Approx. 60000 flash times using Di 866 full power. Maximise the utilisation- Power Pack PS300 provides 2 power sockets. Users are able to work with 2 flashes at the same time. A variety of power supply cables are provided for different camera brands. Heavy Duty Housing- The metal-made shell provides perfect protection. It is safe & durable. For Use with Nissin Di 866 Flashes & Nikon SB900 SB800 SB80DX SB28DX Speedlights