A USB Power Bank is a portable device that acts like an external battery pack and can be used to charge your electronic devices such as smartphones, tablets, and other USB-powered devices. It is a convenient way to keep your devices charged while you're on the go. The Levo PA71 USB Power Bank is a great example of this type of device. It has two USB ports and offers 7100mAh of power, allowing you to quickly charge multiple devices at once. The power bank also includes integrated safety protection features that prevent overcharging, short-circuiting, and overheating. This makes it an ideal choice for anyone who needs a reliable mobile power bank for their everyday needs.