RFID card are increasingly used for access control. However just like any other RFID system, if you don't shield them, they can be read and copied by others. An nice solution for this problem is this cardholder.
It has a metal plate on the back to shield the RFID chip, while keeping one side of the exterior visible. So you can still see the picture of the person. The plastic card holder is attached to this plate with a hinge and a spring keeps them to each other. When you squeeze the tabs on the end, the shielding plate is pushed away from the card and allows the card to be read. This system allows the user to keep their cards shielded and only exposing the RFID chip for reading, when it’s needed. A retractable belt clip is supplied to prevent loss.
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