A USB Power Bank, also known as a portable charger or external battery pack, is a device that stores and provides electrical energy to charge your mobile devices. It is usually rechargeable and can be used to charge a variety of devices such as phones, tablets, and even laptops. A USB Power Bank typically has one or more USB ports for connecting the device to be charged. The Levo PA71 is an example of a popular USB Power Bank which can store up to 7100mAh of energy in its lithium-ion battery. It is lightweight and compact, making it an ideal choice for travelers who need to stay connected on the go. With its built-in safety features, you can rest assured that your device will stay safe while charging.