Typically $439 for a forever license, this is significantly cheaper at $30. Compared to Office 365 subscription which is $99/year for 5 devices, or $69/year for 1 device.
This is a much better deal.
Be sure to associate it with a Microsoft account to avoid ever having to remember the key.
WINDOWS:
Microsoft Office Professional 2021 for Windows: Lifetime License
MAC:
Microsoft Office Professional 2021 for Mac: Lifetime License