This is the genuine Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter (A1790). You can connect Thunderbolt/Thunderbolt 2 devices, such as external hard drives and Thunderbolt docks, to Macs with Thunderbolt 3 (USB-C) or USB4 ports. It's also bidirectional, so you can connect Thunderbolt 3 devices to Macs with Thunderbolt/Thunderbolt 2 ports (macOS Sierra or later). 【Product Condition】 ・Brand new, unused (genuine Apple product) ・Never used ・Stored at home, so there may be very minor scratches visible depending on the light ・Please refrain from purchasing if you are concerned about this 【Shipping Method】 Rakuraku Mercari (anonymous shipping) Immediate purchase OK, first come, first served! #AppleGenuine #ThunderboltAdapter #USB_CConversion #MacAccessories #NewUnused #A1790 #MacPeripherals #AppleAccessories