The readers, storage drives, & hubs leverage USB (Universal Serial Bus) 3.0 technology for high-speed performance, while the Professional Workflow HR2 hub is also designed to deliver next-generation Thunderbolt 2 speeds. Thunderbolt 2 technology gives photographers & videographers the power to quickly transfer 4K video & other large media files, at up to twice the speed of Thunderbolt & up to 4x the speed of USB (Universal Serial Bus) 3.0 devices. The Professional Workflow HR2 hub is also backwards compatible with Thunderbolt & USB (Universal Serial Bus) 2.0 (at slower speeds), while using the same cables & connectors. Simply plug the readers or storage drives of choice into the hub & start transferring & archiving files. It's that easy. Also, the Professional Workflow HR2 hub provides two Thunderbolt 2 ports & one USB (Universal Serial Bus) 3.0 port, making it easy to daisy-chain with your existing setup. Having two Thunderbolt 2 ports also means that you can place the hub anywhere in your lineup of other Thunderbolt devices to create a unique, customizable setup. The hubs help you eliminate cable clutter & take control of your workflow.