in hotels, if you lose your room key card, how are they able to reprogram the new one so it works and the old one doesn’t?

Question

Is there some system that transmits information to your door card reader on what the new key is, or is it something different entirely?

In: 1028

Answer 1

In that case, how do they make the card valid only up to a certain time on your checkout day? And then extend it for example, to 3pm or something like that?