Advantages of the Audi Advanced Key System Audi has a number of features that make your time at the wheel more enjoyable. One of these features is the sophisticated key system. It works via proximity sensors in trunk lids and door handles, and is paired with key radio pulse generators. https://g28carkeys14973.blogoscience.com/35958867/who-is-audi-a3-replacement-key-and-why-you-should-consider-audi-a3-replacement-key