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DESFire EV1 D41 chip Wristbands / DESFire 4K chip Wristbands / NFC Wristbands DesFire 4K is the contactless IC card which is made under MF3 IC D41 ( DESfire EV1 D41). Usually it is called DESFire 4K according to ISO14443A. The UID has four bytes. The storage capacity is 4K. The date can be protected by electronic key.Power consumption: the induced currents without power, healthier, safer safety performance: lightning protection, anti-shock, to meet the requirements of