Portable Emergency AA Battery Charger Extender suitable for the Sandisk Sansa E270 - with Gomadic Brand TipExchange Technology Integrated circuitry regulates output voltage specific to the Sandisk Sansa E270. Advanced logic maximizes overall charger efficiency. Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (Sandisk Sansa E270 specific), TipExchange enabled (Yes) Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors. Internal circuit designed to protect your Sandisk Sansa E270 from power surges, overcharging and short circuiting. This Gomadic Battery Pack can be reused forever by simply inserting fresh batteries, providing instant power on demand.