What is the purpose of the integrated toll module in an Audi A7?

I'm considering purchasing an Audi A7 and I noticed that it has an integrated toll module. What is its function and how does it work?

The integrated toll module in the Audi A7 is designed to make paying tolls easier and more convenient. It uses a small radio frequency transponder built into the car's rearview mirror to communicate with toll stations, allowing for seamless and automatic toll payments without the need for additional devices or account setups.

The main purpose of the integrated toll module in an Audi A7 is to save time and hassle for drivers. It eliminates the need to stop and manually pay tolls, reducing traffic congestion and improving overall driving experience.