PDK Red High-Security 4K Printable Proximity Card Credentials with 13.56 MHz MIFARE DESFire EV2, 25 Pack (PDK-RC)The ProdataKey Red Printable Cards are High Security smart credentials (13. 56 MHz) with a low profile and durable design. PDK Red products lead the industry in secure mobile, and encrypted credential communication protocols. Add your logo to the cards for an additional charge. 4K Memory EAL 5+ Security Level MIFARE DESFire EV2 Encryption 32 bit 13. 56 MHz + 125 kHz Up to 3" read range