MACOS The device works excellently Suitable for studying, browsing, and light design The charger is not original, it has been replaced with a new charger And it works excellently MacBook Air 2017 i5 RAM 8GB SSD 128GB Operating System: macOS Graphics Card: Integrated Storage Type: SSD Screen Size: 13 inches Processor Type: Intel Core i5 RAM Size: 8 GB Brand: Apple