Advantages of the Audi Advanced Key System Audi has a number of convenience features that make time behind the wheel even more relaxing. One of these features is the advanced key system. It works via proximity sensors located in trunk lids and door handles, paired with key radio pulse generators. https://g28carkeys14973.blogoscience.com/36272940/five-things-you-re-not-sure-about-about-audi-a3-replacement-key