The Insta360 Fast Charge Hub is compatible with the ONE R and ONE RS action camera systems. It charges both the Standard and Boosted Battery Bases of the system, at about twice the speed than usual, in a smart sequence based on battery levels. You can charge one or both of the battery bases. When you charge both, the Standard Battery Base attaches to one side and the Boosted Battery Base to the other in a compact, efficient setup. The Fast Charge Hub plugs into any 2A or higher USB power outlet via its USB-C charging port. A compatible USB cable is sold separately.