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Proximity card
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=== Passive cards === Passive 125 kHz cards, the more widely used type which were described above, are powered by [[radio frequency]] signals from the reader device and so have a limited range and must be held close to the reader unit.<ref name="Norman" /> They are used as [[keycard]]s for access control doors in office buildings. A version with more memory, [[contactless smartcard]]s, are used for other applications: [[library card]]s, [[contactless payment]] systems, and [[public transit]] fare cards.
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