Prox cards are often used in access control and tracking applications. The internal metallic antenna embedded in a prox card is less vulnerable to decoding than a magnetic stripe when encountering a strong magnetic field. Signals from prox cards are not easily intercepted.
This contactless technology communicates with an external antenna. Because they only have to be in close "proximity" to the RF (radio frequency) antenna, they are also referred to as contactless cards.
Prox cards have a long card life because they have no physical contact with a reader. These cards are highly secure and some proximity technologies can also be combined with others, such as bar code, magnetic stripe, or smart card.
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