It works well with my Tesla Y, just like the key fob I used to have for my Telsa S. I don't need to have my phone to operate the car. Very helpful for valet service. Very easy to setup. You do need a key card to do this.
If it came with instructions on how to pair it with your particular car, it would be a lot easier. I believe that I have it paired but it is not functional ( won't lock or unlock and won't open the trunk or frunk).