

It’s got a metal key inside the housing that unlocks the doors and the fob sensor is actually inside the armrest so if the battery is dead you place the fob inside a pocket in the armrest and it authenticates your fob with NFC and you drive away. Closest I’ve seen in a modern car anywhere.
Mines a 2017 but they didn’t change this over time as far as I understand. GM had a bad problem with the key-in-ignition a few years ago and will likely never use them again.