Gomadic Advanced Nintendo 3DS compatible AA Battery Pack Charge Kit &ndash; Portable power built with upgradeable TipExchange Technology Integrated circuitry regulates output voltage specific to the Nintendo 3DS. 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 (Nintendo 3DS specific), TipExchange enabled (Yes) Easy to operate. Simply insert batteries, toggle on/off switch and your Nintendo 3DS will start to charge. Safely engineered with reverse polarity protection, in the event batteries are accidentally put in incorrectly.