It's a spring loaded center punch. If your car goes into water it's almost impossible to open the doors and electric windows won't work.
Put this little device against the glass, hit the release button, and you have an instant escape route.
L
Sometimes you need to cut the seatbelt too...
I wondered about that when I saw the car.
I didn't notice when they showed the car if any windows were broken. I pray they weren't fighting to get out.....