Gomadic Advanced AA Battery Pack Charge Kit Compatible with Panasonic HC-VX870 / HC-VX878 &ndash; Portable power built with upgradeable TipExchange Technology 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-VX870 / HC-VX878 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. Integrated circuitry regulates output voltage specific to the Panasonic HC-VX870 / HC-VX878. Advanced logic maximizes overall charger efficiency. Easy to operate. Simply insert batteries, toggle on/off switch and your Panasonic HC-VX870 / HC-VX878 will start to charge. The rugged composite design is built to last. This product is backed by our comprehensive Gomadic Lifetime Warranty.