Gomadic Advanced Mio P550 compatible AA Battery Pack Charge Kit &ndash; Portable power built with upgradeable TipExchange Technology Integrated circuitry regulates output voltage specific to the Mio P550. 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 (Mio P550 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 Mio P550 user.