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    2021-10-10u2002·u2002Low Frequency 125KHz TK4100/EM4200 RFID Tags. TK4100 is a CMOS integrated circuit for use in 125 kHz read-only RFID Tags, It is compatible with EM format and does not require a built-in power supply and can use without contact, and has a long service life.TK4100 chip RFID Tags are much cheaper and very competitive in price. Products.

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