Gomadic High Capacity Rechargeable External Battery Pack suitable for the Motorola Droid X Integrated circuitry tailors output voltage and charging current to exact specification of the Motorola Droid X (accurate to 0.1v). Very easy to operate. Simply connect Motorola Droid X, press activation button on pack, and charging begins. Quick start guide included. Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Motorola Droid X Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Internal circuit protects the Motorola Droid X from various power ailments including surges, overcharging and short circuiting. Advanced logic maximizes charger efficiency. Charging kit includes: Rechargeable Lithium Battery Pack, USB input/output cable, Motorola Droid X Charging Connection, and Battery Pack input connection.