What technology is used for Audi A1's park assist feature?

I've been researching about the Audi A1 and I am curious about the park assist feature. Can anyone tell me what technology is used for this feature and how it works?

The park assist feature in Audi A1 uses ultrasonic sensors to detect obstacles and automatically steer the car into a parking space. It also has a rearview camera for added assistance.

The park assist feature uses Audi's park steering assistant, which combines sensors and computer-controlled steering to help guide the car into a parallel or perpendicular parking space. As someone who always struggles with parallel parking, I find this feature incredibly helpful.