Use first-generation Thunderbolt and Thunderbolt 2 devices with your new Thunderbolt 3 computer. With this adapter, you can connect newer Windows based Thunderbolt 3 computers to older Thunderbolt devices, such as external hard drives, Thunderbolt displays, and older Thunderbolt capable Mac computers. Newer Thunderbolt 3 computers include the latest models of Dell Precision and Dell XPS. Because this adapter is backward compatible, you can connect to first-generation Thunderbolt devices at 10Gbps speed. With Thunderbolt 2 devices, you can connect at 20Gbps. The adapter satisfies all requirements for bi-directional data transfers and simultaneous power for bus-powered devices. Your computer's Thunderbolt 3 ports might not function properly until you update one or more of the following on your computer: BIOS; Thunderbolt firmware; Thunderbolt 3 controller drivers; Thunderbolt 3 software. The required updates will vary depending on your computer.