Unique Gomadic Portable Rechargeable Battery Pack designed for the Tascam DR-100 MKII - High Capacity Gomadic charger that fits in your pocket Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Tascam DR-100 MKII 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 Tascam DR-100 MKII (accurate to 0.1v). Very easy to operate. Simply connect Tascam DR-100 MKII, press activation button on pack, and charging begins. Quick start guide included. 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 Built using unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping the physical connector.