[ajross]

FWIW: my understanding is that the current generation of fobs are just bluetooth devices speaking the same protocol as the app.

[breser]

Could be. I don't believe the old fobs were bluetooth.

For what it's worth I also didn't mention that at least the old fobs also had an RFID in them that if the battery was dead you could just hold them up to certain spots on the car to open/drive it.