The Lenovo PA 10400 is a power bank that comes in handy when your device is running out of charge while on the go. It has two USB ports so you can connect more than one device to it at a time. This power bank is compact so you can carry it in your bag and charge your device even while travelling. It has a capacity of 10400 mAh. It comes with 2 USB ports, each with an output of 2.1 amperes.