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Website:https://www.syntekrfid.com/rfid-card/clamshell-card/rfid-clamshell-card.html
ID thick card: thickness 1.8mm, standard card size, is the most economical radio frequency IC card, with ID number, with a portable hole, can screen print LOGO text information.
It relies on the card reader to sense and read out the unique card number stored in the chip EEPROM. The card number is written once before the card is sealed, and cannot be changed after the card is sealed.