Power Bank, 4000 mAh with Fast charger technology, is the perfect accessory for those who need an extra charger always with them. Power bank 4000 mAh is equipped with Micro USB output for charging the battery itself and with two USB ports, one of which is Fast charger and allows to charge up to 65% of the battery in just 30 minutes. Power bank 4000 mAh provides 2 extra charge cycles for smartphones and 1 extra charge cycle for tablets.