How does the Audi A7's intelligent key system work?

I'm interested in learning more about the car's key system and how it operates. Can someone provide a technical explanation?

The Audi A7's intelligent key system is a proximity-based technology that allows you to lock, unlock, and start your vehicle without having to physically insert the key. It works through radio frequency waves, constantly communicating with the car's sensors to ensure it is in close proximity and can be operated.

The intelligent key system also offers a variety of advanced features, such as keyless entry and start, automatic locking/unlocking when walking away/approaching the car, and the ability to set specific preferences for different drivers.