With this adapter, you can connect Windows and Mac based Thunderbolt™ 3 computers to older Thunderbolt devices, such as external hard drives, Thunderbolt displays, and older Thunderbolt capable Mac computers. 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. The TBT3TBTADAP is backed by a 2-year warranty for guaranteed reliability. 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. For an up-to-date list of affected computers and instructions, visit http://thunderbolttechnology.net/updates. If your manufacturer isn't listed on the Thunderbolt website, contact your manufacturer. More from the Manufacturer More from the Manufacturer