Gomadic Portable AA Battery Pack designed for the Creative Zen Vision W - Powered by 4 X AA Batteries to provide Emergency charge. Built using TipExchange Technology Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors. Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (Creative Zen Vision W specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Creative Zen Vision W. Advanced logic maximizes overall charger efficiency. The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty. A must have accessory for the frequent traveler, camper or heavy Creative Zen Vision W user.