Powerful Lithium Polymer Rechargeable Gomadic Brand Battery Pack High Capacity Portable Charger Compatible with Cradlepoint PHS 300 with upgradeable TipExchange Technology Very easy to operate. Simply connect Cradlepoint PHS 300 , press activation button on pack, and charging begins. Quick start guide included. Integrated circuitry tailors output voltage and charging current to exact specification of the Cradlepoint PHS 300 (accurate to 0.1v). Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Cradlepoint PHS 300 Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Designed with a front facing LED display that clearly display the current battery capacity at the touch of a button Internal circuit protects the Cradlepoint PHS 300 from various power ailments including surges, overcharging and short circuiting. Advanced logic maximizes charger efficiency