Powerful Lithium Polymer Rechargeable Gomadic Brand Battery Pack High Capacity Portable Charger Compatible with Samsung Focus with upgradeable TipExchange Technology Very easy to operate. Simply connect Samsung Focus, 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 Samsung Focus (accurate to 0.1v). Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Samsung Focus Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Charging kit includes: Rechargeable Lithium Battery Pack, USB input/output cable, Samsung Focus Charging Connection, and Battery Pack input connection. Elegant, compact design is approximately the size of a standard deck of playing cards. Rugged exterior is built to last and backed by Gomadic Lifetime Warranty