Use legacy Thunderbolt devices with your new Thunderbolt 3 computer. With this adapter, you can connect newer Thunderbolt 3 computers to legacy Thunderbolt devices, such as external hard drives, displays, & older Thunderbolt capable Mac computers. Newer Thunderbolt 3 computers include the latest models of Dell Precision & Dell XPS. Because this adapter is backward compatible, you can connect to first-generation Thunderbolt devices at 10 Gbps speed. With Thunderbolt 2 devices, you can connect at 20 Gbps. The adapter supports bi-directional data transfers & simultaneous power delivery for bus-powered devices. You can also set up 10 Gbps peer-to-peer networking between older Thunderbolt laptops & newer Thunderbolt laptops. This is perfect for setting up small workgroups & sharing peripherals such as printers & storage or quickly migrating data to a new computer.