Peace be upon you. Serious buyers only and urgent: The device is good and working, and its version is 2015. The reason for selling is that I finished university and no longer need it. These are the device specifications for credibility: Model Name Model Identifier Processor Name Processor Speed MacBook Air MacBookAir6,2 Intel Core i7 1.7 GHZ Number of Processors: Total Number of Cores: L2 Cache (per core): 256 KB L3 Cache: 4 MB Memory: 8 GB