Thunderbolt 3 to Thunderbolt 2 Adapter - Backward Compatible - USB C to Mini DisplayPort - USB-C to Thunderbolt 2 Use first-gen Thunderbolt and Thunderbolt 2 devices with a new Thunderbolt 3 computer Thunderbolt 3 to Thunderbolt Adapter / Thunderbolt 3 USB C to Thunderbolt / USBC / Thunderbolt 3 USB Type-C to Thunderbolt Compatible with first-gen Thunderbolt & Thunderbolt 2 devices. PVC Polyvinyl Chloride ,Cable Shield Type The adapter is backward compatible, it can connect to first-generation Thunderbolt devices at 10Gbps speed. With Thunderbolt 2 devices, you can connect at 20Gbp. Operating system compatibility is windows 8.1, 10 and mac operating system 10.12 to 10.14 Note-it will not work with mini display port or display port monitors. This is an active adapter cable. Any host system that does not provide the full 15 watt of bus power will not work with this device. Consult the manufacturer of your host system to determine how much bus power your host system provides. Product can pass 12 watt of power through the thunderbolt 2 port