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Now reader technology is more and more cattle, why do you say, its readers through its internal coil constantly emit an electromagnetic field that is excitation signal, within a range when a proximity card reader on, coil in the card reader is excited by the induction coil produces a weak signal current card as a small integrated circuit power supply, the IC card manufacturing savings have had only given identification number entered. number. And identification numbers can produce electricity thanks to the reader coil, the developer has now developed the inductive reader. Such things will appear smooth, are attributed to the reader coil ah.