Denny Studo Flashes Z-100,160 &320 can be used anywhere, with the Zap-Pac Battery Power Supply. Even in the most remote locations, you can have professional studio results. A fully charged battery will support approximately 115 full power flashes at 320 watt-seconds and 200 at 160 watt-seconds. The built-in level indicator shows battery power status, with a red light to tell you when it needs to be charged again. The battery is supplied with a protective padded case, case strap/clip, charge adapter and light cable.