Sunpak TR-2000 Power Pack Kit with Nicad Battery & Charger, Requires Connecting Cord to Flash.

The TR2000 universal high-voltage battery pack is a flexible power source for both high-and low-voltage flash units, including non-Sunpak brands. Whether you need 6 volts or 330 volts, whenever you need it, you have it with the TR2000. Continuous, unlimited power is yours simply by swapping interchangeable power clusters. A power status indicator lets you know when to insert a fresh battery cluster, and Memory-Free technology assures that your Sunpak battery clusters give you 100% capacity every time. Only 24 ounces, and a compact 5" x 6" x 2.5" with an interchangeable NiCad battery cluster in place. Shoulder strap and battery charger included.