The hubs are provided with a power cable that plugs into the wall and a certified USB cable that goes from the hub to your computer’s USB 2.0 port. We recommend that you use the cables provided by Apple with each iPad to connect each iPad to the hub. If those are not available, be sure to use either an Apple-provided cable (USB-to-30-pin or USB-to-Lightning connector) or a cable that is not only USB 2.0 certified but meets Apple’s specifications. Many inexpensive third party cables are either not durable enough for frequent charge and sync use or are not properly shielded or configured, which could effect the charge and sync function. Datamation Systems offers a bundle of certified USB-to-30-pin cables of a type we have had tested to assure their compliance with these standards. We encourage you to purchase Apple-provided cables or contact us for more information.