Used *It appears to be Thunderbolt 1, not Thunderbolt 2. My mistake. I have added an image of the specifications. Please check it. Thank you for pointing this out in the comments. I have also corrected the text.* Thunderbolt-connected external SSD Transcend JetDrive 855 SSD replaced with 250GB For 12+16 pin special connector SSD This is the shape used in the 2015 MacBook Air and MacBook Pro models. I think this enclosure can still be used by those who have an SSD from this period. - Brand: Transcend - Model Name: JetDrive 855 - Storage Capacity: 250GB - Connection Type: Thunderbolt The original box says 960GB, but please note that it has been replaced with a 250GB SSD.