The Audi Advanced Key works by sending signals to the proximity sensors located in each car door and trunk lid. These sensors can detect the radio pulse generator inside the key that activates whenever you’re within 5 feet of your Q7 SUV. Once you open the door or trunk, the SUV will automatically unlock. Find the best used 2017 Audi Q7 near you. Every used car for sale comes with a free CARFAX Report. Still top of the line 2015 Audi Q7 For Sale (365 listings) UNXn.