Let me start off by saying I love this external battery. The size is smaller than others I have used, and the inclusion of the laser pointer and led are great additions. The one thing that is not clear is how it charges, which is brilliant. It uses a usb to microusb cable to charge the device so it can be charged by basically any modern phone adapter, but the best part is that once charged, the same cable can carried in the case (also a great addition) and then used to charge your phone (assuming it's not a iphone, which would require apple's usb cable). Great quality and good aesthetics.