ISO/IEC 15693

ISO/IEC 15693, also called I-CODE 2, I•CODE SLI, or C370, is an ISO standard for vicinity cards, i.e. cards which can be read from a greater distance as compared to proximity cards.

ISO/IEC 15693 systems operate at the 13.56 MHz frequency, and offer maximum read distance of 1–1.5 metres. As the vicinity cards have to operate at a greater distance, the necessary magnetic field is less (0.15 to 5 A/m) than that for a proximity card (1.5 to 7.5 A/m).