Contactless ISO CR-80 13.56MHz high security and HID Prox 125 KHz smart card, with two separate data areas for the access control: SIO™ and iCLASS™. Backwards compatibility with iCLASS™ systems guaranteed. iCLASS™ SE (SIO) memory with 32 Kbits (4 KBytes), in 16 applications areas (2 Kbits per area).