What is this button?!

[Ksjrb03]

Doesn’t every car have this?

Yes

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[Raynfeathyr]

It ejects the passenger. Damn someone beat me to it.

It shuts off the "courtesy" lights... basically makes it so when you open the doors on the vehicle the lights do not turn on automatically.

Hence why the picture has an overhead image of a vehicle with the door open.

Listen.... I've deciphered Lucky Lager bottle caps and ancient Egyptian Hieroglyphics that were easier to make out ....