The OS is Mac OS Sequoia 15.1.1 (updated 11/29). There are scratches on the bottom surface from being set down. The top surface was covered with a silicone sheet, so there are no noticeable scratches in visible areas and it's very clean. Contents: Main unit, power cable Outer box, cardboard for packaging Please refrain from purchasing if you are sensitive to used items. Thank you. Model: Mac mini CPU Type: Apple M1 Number of Cores: 4 cores Memory Capacity: Under 8GB to 16GB OS: Mac OS