The Thunderbolt 3 to Thunderbolt 2 Adapter from Apple
Converts a Thunderbolt 3 port on a system to a Thunderbolt 2 port, letting you use previous-generation devices on your new Thunderbolt 3 computer. This adapter supports external storage drives as well as displays. With a bi-directional design, you can connect a Thunderbolt 3 mobile device to a Thunderbolt 2 computer, using an optional Thunderbolt 2 cable. Additionally, Thunderbolt 3 is a hardware interface that utilizes a USB-C connector, which offers a reversible design.