Portable Emergency AA Battery Charger Extender suitable for the Panasonic HC-V550 / V550 - with Gomadic Brand 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-V550 / V550 specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Panasonic HC-V550 / V550. 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. This Gomadic Battery Pack is uniquely designed to work with both standard (e.g. alkaline) and/or rechargeable AA batteries. Safely engineered with reverse polarity protection, in the event batteries are accidentally put in incorrectly.