How does the smart seatbelt in the Audi A2 work?

I've heard that the Audi A2 has a smart seatbelt feature. Can someone explain how it works and how it improves safety?

The smart seatbelt in the Audi A2 uses sensors to detect when a passenger is not wearing their seatbelt and notifies the driver through an audible alert. It helps remind passengers to buckle up and improves overall safety on the road.

In addition to the audible alert, the smart seatbelt also tightens slightly when a passenger is not wearing it. This provides a physical reminder and can prevent serious injuries during an accident. I've found it to be very effective in keeping my passengers safe.