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 (1st Generation) specific), TipExchange enabled (Yes) * Integrated circuitry regulates output voltage specific to the Amazon Kindle (1st Generation). 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 (1st Generation) from power surges, overcharging and short circuiting.