It is Windows 10 Professional, genuine license key. It will work on both the versions (32 Bit and 64 Bit version) of Windows 10 Pro.
You can perform a clean installation of Windows 10 Pro to get the product activated. If you are having any other versions of Windows 10 Professional like Windows 10 Pro N, then you may have to clean install Windows 10 Pro and then use this product key.
With Windows 10 Pro, you’ve got a great business partner. It has all the features of Windows 10 Home, plus necessary business functionality for encryption, remote log-in, creating virtual machines, and more. Get fast start-ups, a familiar yet expanded Start menu, and great new ways to get stuff done, plus innovative features like an all-new browser built for online action and Cortana, the more personal digital assistant.