PDK Red High-Security 8K Smart Key Fob Credentials 25 Pack with 13.56 MHz MIFARE DESFire EV2 (PDK-RKF)The ProdataKey Red Key Fobs 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. 8K Memory EAL 5+ Security Level MIFARE DESFire EV2 Encryption 32 bit 13. 56 MHz Up to 1" read range