SCALA keyring classic, black, MIFARE DESFire 2K, The classic keyring is particularly robust, break-proof and waterproof, the cover part is ultrasonically welded. It is not possible to open the housing tag, In the RFID technology MIFARE DESFire, the keyring is available in the so-called speed variant. With this variant, the reading distance is greater than with a normal MIFARE DESFire keyring, the serial number is printed on the keyring, black, MIFARE DESFire Speed, 4 k, with serial number