Gomadic Advanced AA Battery Pack Charge Kit Compatible with Panasonic HC-WX970 / HC-WX979 &ndash; Portable power built with upgradeable TipExchange Technology Integrated circuitry regulates output voltage specific to the Panasonic HC-WX970 / HC-WX979. 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 (Panasonic HC-WX970 / HC-WX979 specific), TipExchange enabled (Yes) This Gomadic Battery Pack can be reused forever by simply inserting fresh batteries, providing instant power on demand. This Gomadic Battery Pack is uniquely designed to work with both standard (e.g. alkaline) and/or rechargeable AA batteries.