Portable Emergency AA Battery Charger Extender suitable for the Zoombak Advanced GPS Universal Locator - with Gomadic Brand TipExchange Technology Integrated circuitry regulates output voltage specific to the Zoombak Advanced GPS Universal Locator. Advanced logic maximizes overall charger efficiency. 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 (Zoombak Advanced GPS Universal Locator specific), TipExchange enabled (Yes) This Gomadic Battery Pack can be reused forever by simply inserting fresh batteries, providing instant power on demand. A must have accessory for the frequent traveler, camper or heavy Zoombak Advanced GPS Universal Locator user.