The QWERTY format.
Works without drivers on Windows as well as Linux.
TKL format (tenkeyless) this keyboard and very compact and requires little time to adapt. Most non-physically present keys can however be "emulated" via the Fn button. The user manual (two-sided page) shows what commands you can use.
This keyboard also allows you to program macro, but I have not tested, not having need.
The backlight level can be configured through commands with the Fn key. The level is stored between restart the PC.