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Definition of proximity cards, namely contactless IC card, is the world in recent years, a new technology developed, it succeeded in RF technology and IC card technology together to solve the passive (no power supply card) and free access This problem is a major breakthrough in the field of electronic devices by non-mechanical contact with the reader devices to exchange data in the form to complete all or part of the function of a card IC card, IC card and RFID technology combined with the product, is a non-contact IC card (also known as radio frequency card). Composition generally consists of an induction coil, microchip and the card surface and the support material. Features card no special power supply; between it and the reader without mechanical contact, avoid contact failure; its surface without bare chip, waterproof, and easy to produce static electricity breakdown, bending damage and other problems; card use no positive and negative. In short, non-contact IC card with high reliability, ease of use, the operating speed and so on.