Portable Emergency AA Battery Charger Extender suitable for the Garmin Nuvi 500 - with Gomadic Brand TipExchange Technology 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 500 specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Garmin Nuvi 500. 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. A must have accessory for the frequent traveler, camper or heavy Garmin Nuvi 500 user. Safely engineered with reverse polarity protection, in the event batteries are accidentally put in incorrectly.