Mirage room safes

First off thanks for all the help you%26#39;ve given us so far and Happy Thanksgiving to everyone. I%26#39;m trying to find out if the room safes in the Mirage work by a 3 or 4 digit code you create or by a magnetic card swipe. Thanks in advance...

Mirage room safes

You create a 4 digit code

Mirage room safes

Thanks

very welcome