Don’t buy this and expect it to last through an apple update, I only used mine for about 72 hours, only enough time to load in some of my data from my old computer.  Time went buy a bit, I booted it up, got prompted to update it, when it froze up won’t restart upon having an apple so system update. Contacted seller a couple of times to see if maybe they could wipe it and restore the original os, but no help there… they will refer you to apple. Very poor service. Waste of $1000