This article comparing “prox cards” to “RFID cards” is full of the biggest pile of 
I have seen.
Apparently “prox cards” are low frequency cards operating at around 125 kHz… Or was that 13.56MHz? It claims both at different points. 
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i can see the lapse in their research. they must have come across “hid prox” which is LF and just decided prox the model and prox the word are the same
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RFID systems can be implemented in a range of doors and locks due to having a diverse range of cams and spindle lengths
The what and the what?
I fail to see how many of their pros/cons are relevant to the differences between technologies. It seems more like this article is trying to compare RFID/“Prox” to traditional keys.
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