These are never used brand new pull from Brand New Laptops. Drives have Windows 10 Pro 64bit pre-installed on them. Drive has 3 years manufacturer warranty. These Drives can also be used in Desktop Computers. There are videos on the internet/youtube that explain how to use them in Desktop.
If your laptop originally came with windows 10 PRO installed, it means it has digital license and window will automatically activate once you connect to internet.
For Laptops that shipped Win 10 HOME and older laptops that came with windows 8 and earlier a windows key may be required for activation. There are sellers on ebay selling it for about $5.