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| Embedded in each proximity card is an antenna which transmitts information encoded as a radio signal. (Anther name for ID badges of this kind is "Radio Frequency Identification", or RFID cards.) A proximity card reader positioned between 2.5 and 20 inches (depending on the model chosen) receives this signal and grants or denies access accordingly. Unlike contactless smart cards, proximity cards do not have the ability to have new information written onto them. |
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