Stylish and soft black PU leather folder with a built-in, external auxiliary battery of high charge capacity -5,000 mAh-. In sober design and zipper opened, with plenty of storage compartments to store business cards, USB flash memories, plus a touch screen case for smartphones and LED charge indicators on the back of the folder. Includes a 20-page A4-size notepad and a tablet holder up to 9.7 inches. The easy access to the charging station via micro USB cable - included- make of this folder the perfect gadget for business and studying. The capacities shown in all our external auxiliary batteries are real, all of them incorporating non-recycled, grade A batteries, with a service life of at least 500 charging cycles, and complying with CE regulations. In addition, they are manufactured according RoHS standards, and in compliance with the following safety requirements: Power bank overcharge protection system. Complete discharge protection system, which increases the durability of the power bank. Blocking system to prevent short circuits. Constant charging transfer system, in accordance with the capacity of the target device.