Thank you for viewing. This is an Apple genuine Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter, model A1790. I purchased it about three years ago to connect an old Mac to an audio interface. I tried connecting a Thunderbolt 2 cable through this adapter, but it wasn't compatible and wasn't recognized. I ended up using a USB connection, so I never used it. Now, I don't have any equipment to test it with, so its operation is unconfirmed. Please understand that I cannot accept returns if, like me, you purchase it and find it doesn't work, so please research carefully before purchasing. The box has some slight wear. Please check the appearance in the images. It's in near-new condition, but please understand that it is a used item with unconfirmed operation. Thank you. - Brand: Apple - Product Name: Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Model: MMEL2AM/A (A1790) - Connectors: Thunderbolt 3 (USB-C) / Thunderbolt 2 - Purpose: Data transfer/connection - Compatible devices: MacBook, etc.