Mini portable style and USB charging Can be use as Power Bank Convenient to carry 2200mAh high-capacity lithium battery Low power consumption Energy saving Output Power MAX: 4W Input Voltage: DC 5V Output Voltage: DC 5V-9V Input Current: 0.5A-1A Working Time: 2 hours in Gear 3; 3.5 hours in Gear 2; 6.5 hours in Gear 1 Battery Specification: 18650 Li-ion Battery Installation: Removable Material: ABS Dimension: 140 x 105 x 42mm