Gomadic Advanced Gomadic micro USB Devices compatible AA Battery Pack Charge Kit &ndash; Portable power built with upgradeable TipExchange Technology Integrated circuitry regulates output voltage specific to the Gomadic micro USB Devices. 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 (Gomadic micro USB Devices specific), TipExchange enabled (Yes) Easy to operate. Simply insert batteries, toggle on/off switch and your Gomadic micro USB Devices will start to charge. The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty.