Gomadic Portable AA Battery Pack designed for the Garmin Nuvi 755T - Powered by 4 X AA Batteries to provide Emergency charge. Built using TipExchange Technology Integrated circuitry regulates output voltage specific to the Garmin Nuvi 755T. 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 (Garmin Nuvi 755T 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. A must have accessory for the frequent traveler, camper or heavy Garmin Nuvi 755T user. The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty.