![]() ![]() Prox cards have no internal power source, so there are never any batteries to replace. ![]() ![]() Inside each card or keyfob is an integrated circuit containing specific numerical programming and a coiled antenna, which increases the range at which the card can be read. Proximity cards, also known as Prox cards or access control cards, are contactless ID cards or keyfobs containing programming that is “read” by a card reader to control and secure physical access.
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