Lenovo ThinkPad T15 1st Gen 15.6" (512GB SSD, Intel Core i7 10th Gen., 4.90GHz, RAM 16GB. Windows pre-installed, The motherboard has a built in Windows 10 key. Simply install from a USB and it will register the windows key automatically. I have multiple units (Can send pictures of specific device if requested) Lightly used in business setting. Please message me with any questions.