Portable Emergency AA Battery Charger Extender suitable for the Literati Color eReader - with Gomadic Brand 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 (Literati Color eReader specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Literati Color eReader. Advanced logic maximizes overall charger efficiency. Safely engineered with reverse polarity protection, in the event batteries are accidentally put in incorrectly. Internal circuit designed to protect your Literati Color eReader from power surges, overcharging and short circuiting.