Gomadic Advanced Amazon Kindle Paperwhite compatible AA Battery Pack Charge Kit &ndash; Portable power built with upgradeable TipExchange Technology 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 (Amazon Kindle Paperwhite specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Amazon Kindle Paperwhite. Advanced logic maximizes overall charger efficiency. The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty. Internal circuit designed to protect your Amazon Kindle Paperwhite from power surges, overcharging and short circuiting.