... power bank with usb battery charger 1,Portable,mini size. 2,Rechargeable polymer battery. 3,Led lighting. ... potable mobile power bank with usb battery charger 1. Product Specifications: Bluetooth Specification ... output voltage, electric current: DC5.0V 500mAh Battery Capacity:3.7V 2200mAh Taiwan patent: M 424721 ... 5. Pictures showing the functions and how to use by steps. (a) Function 1, music player ...