It is an upgrade SSD that can easily increase the capacity of MacBook Air.
Transcend SSD MacBook Air exclusive upgrade kit (Mid 2012 [11 "& 13"]) SATA 3 6 Gb / s 240 GB 5 year warranty JetDrive / TS240 GJDM 520

https://www.youtube.com/watch?v=gBEf1DDTuAE

Follow me!