Gomadic Advanced Cradlepoint PHS 300 compatible AA Battery Pack Charge Kit &ndash; Portable power built with upgradeable 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 (Cradlepoint PHS 300 specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Cradlepoint PHS 300 . Advanced logic maximizes overall charger efficiency. Internal circuit designed to protect your Cradlepoint PHS 300 from power surges, overcharging and short circuiting. A must have accessory for the frequent traveler, camper or heavy Cradlepoint PHS 300 user.