Gomadic High Capacity Rechargeable External Battery Pack suitable for the Samsung Galaxy Note 10.1 Tablet Very easy to operate. Simply connect Samsung Galaxy Note 10.1 Tablet, 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 (Samsung Galaxy Note 10.1 Tablet Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Integrated circuitry tailors output voltage and charging current to exact specification of the Samsung Galaxy Note 10.1 Tablet (accurate to 0.1v). 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 Continue to use your Samsung Galaxy Note 10.1 Tablet for hours OR recharge it on the go without being tethered to a wall outlet