With this adapter you can connect newer thunderbolt 3 computers to legacy 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 supports bi directional data transfers