​​How do Hotel Key cards work?


There are many types of key card systems used around the world, but their principles are all fundamentally very similar. 

When you check in to a hotel, the hotel receptionist uses a machine to store a code onto a magnetic strip or computer chip on your key card. 

This code matches the one stored by your hotel room’s electronic lock, which reads the code when you insert the card, and then switches on a small motor to unlock the door to your room. 

To change the code for each new guest, the lock is either sent a new code by a network, or the card and lock have the same preset list of codes. They can then be instructed to use the next one in the sequence when required.

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