What is the Smart Key System in the Audi A1 and how does it work?

I've heard about the Smart Key System in the Audi A1 but I'm not sure what it actually does and how it functions. Can anyone explain this feature to me?

The Smart Key System in the Audi A1 is a convenience feature that allows you to unlock and lock your car without using the physical key. You can also start the engine without inserting the key. This works by using sensors in the door handles and push button ignition to detect the presence of the key fob.

The Smart Key System also allows you to set up personalized driver profiles. For example, you can save your preferred seat and mirror settings, as well as your music and navigation preferences. When you unlock your car with your key fob, these settings will automatically adjust to your preferences.

One tip for using the Smart Key System in the Audi A1 is to remember to always have your key fob with you when you exit the vehicle. If you forget it inside, the car will not lock automatically and you may have difficulty starting the engine when you return.