Commonly known as employee badges or hotel room cards, ISO Cards of HF 13.56 MHz are commonly used for access control & security needs.
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Proximity cards work using radio frequency identification and don't require you to insert or swipe your card. Hold it near the door lock for a moment and the electronic reader inside powers the card using a radio signal, in turn, sending the chip serial number back to the reader to identify the card.
While specific hotel door lock systems may vary by hotel, chances are they use one of the following hotel room door locks: Magnetic Door Locks. Radio-Frequency Identification (RFID) Door Locks.
Hold it near the door lock for a moment and the electronic reader inside powers the card using a radio signal, in turn, sending the chip serial number back to the reader to identify the card. The reader usually produces a beep and the light on the lock changes green to indicate the card has been read.
The NFC technology allows the card to communicate with the hotel key card system without them physically touching. So like RFID cards, the cards don't have to be swiped for the card reader to receive access to the room.
Magnetic stripe technology is the most common method used in hotel key cards. Similar to credit cards, these cards have a magnetic stripe that is encoded with data. When the card is swiped through a card reader, the information is read and then compared to the data stored in the hotel's system.
RFID wallets are indeed capable of going through airport security without any significant issues. The amount of metal in these wallets is usually too small to cause any major disruptions during security checks.