As a bidirectional adapter, it can also connect new Thunderbolt 3 devices to a Mac with a Thunderbolt or Thunderbolt 2 port and macOS Sierra or later.
In addition, it can be used to connect Thunderbolt-enabled displays to any of the Thunderbolt 3 (USB-C) / USB 4 ports on your Mac.
What’s in the Box
Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter