Unique Gomadic Portable Rechargeable Battery Pack designed for the Kobo Vox - High Capacity Gomadic charger that fits in your pocket Integrated circuitry tailors output voltage and charging current to exact specification of the Kobo Vox (accurate to 0.1v). Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Kobo Vox Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Very easy to operate. Simply connect Kobo Vox, press activation button on pack, and charging begins. Quick start guide included. Continue to use your Kobo Vox for hours OR recharge it on the go without being tethered to a wall outlet Charging kit includes: Rechargeable Lithium Battery Pack, USB input/output cable, Kobo Vox Charging Connection, and Battery Pack input connection.