Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter Product Features The Thunderbolt 3 (USB-C) to Thunderbolt 2 adapter lets you connect Thunderbolt and Thunderbolt 2 devices external hard drives and Thunderbolt displays, for example to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro. As a bidirectional adapter, it can also connect new Thunderbolt 3 devices to a mac with a Thunderbolt or Thunderbolt 2 port. In addition, it can be used to connect Thunderbolt-enabled displays such as the Apple Thunderbolt Display and LG Thunderbolt 2 displays to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro. However, using this adapter with an Apple Thunderbolt Display requires a power source, because the display does not provide power through the adapter. Note: This adapter does not support DisplayPort displays like the Apple LED Cinema Display or third-party DisplayPort and Mini DisplayPort displays. Compatible with MacBook Air, MacBook Pro, iMac, Mac Pro and Mac mini with thunderbolt ports Requires macOS Sierra.