The Transcend 480GB JetDrive 825 Thunderbolt External SSD TS480GJDM825 takes a PCIe 3.0 x2 M.2 SSD and combines it with an aluminum Thunderbolt enclosure, thus providing a fast and portable storage drive for select Thunderbolt-equipped Apple systems, such as the MacBook Air, MacBook Pro with Retina Display, Mac mini, and Mac Pro.