Gomadic Portable AA Battery Pack designed for the Magellan Roadmate 800 - Powered by 4 X AA Batteries to provide Emergency charge. Built using TipExchange Technology Integrated circuitry regulates output voltage specific to the Magellan Roadmate 800. Advanced logic maximizes overall charger efficiency. Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (Magellan Roadmate 800 specific), TipExchange enabled (Yes) Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors. Easy to operate. Simply insert batteries, toggle on/off switch and your Magellan Roadmate 800 will start to charge. This Gomadic Battery Pack can be reused forever by simply inserting fresh batteries, providing instant power on demand.