I purchased this item new shortly after its release and have been using it for about three years. The dedicated blue USB cable is also included, so you can use it right away. *Please note that a USB power adapter is not included, so you will need to provide your own. A Type-C USB adapter can be used. Since this item consumes a lot of power, a power adapter with a higher output is recommended. If you have difficulty obtaining one, I can include a USB adapter and a Mac adapter for an additional 6000 yen. Regarding the battery, it is a consumable item, so I cannot say how long it will last. From my experience, it seemed to last about half a day without boosting. Please be aware that the box has some dents and scratches. If you have any other questions, please feel free to ask.