Double interface card is PVC laminated chip by coil and become, based on single chip, set and contactless interface contact as one of the smart card, it has two interface, on chip visit, can contact the way through contacts, also can pass a certain distance apart (within 10 cm) to RF way to access the chip. The card is only a chip, two interfaces, through the contact interface and the interface can carry out the same operation. Two interface respectively follow two different standards, contact interface with ISO/IEC 7816; The contact with ISO/IEC 14443. The two interface share the same microprocessor, operating system and EEPROM. CARDS include a microprocessor chip and a microprocessor connected with the antenna coil, the electromagnetic field generated by reading and writing is to provide energy, through the RF way realization energy supplies and data transmission.

A double interface card application:
As a product of the smart card high-end applications, with its convenient application mode, double interface card now also have been applied in the financial, social security, transportation, utilities, highway, park, city of tickets for smart card system, etc.