• Asynchronous data communications protocol: (T=0, 9600 bit/sec)
• Working voltage: 3 and 5 volt (card of AB type)
• Cryptographic algorithms: DES and Triple DES. Simultaneous protection of access to operations by key and PIN-code is possible.
• There are cards in a family, which can be used as a SAM-module for working together with user's card Payflex.

The main distinguishing feature of PayFlex cards is support of specialized file type (so called "electronic purse") and of specific operations set for these files: debit(balance decrease) and credit (balance increase). These operations are distinguished by rights of access. Each operation of balance change is protected without fail and is arranged in such a way so that under no circumstances a violator couldn't repeat it intercepting data communication by operation carrying out.

This feature defined the use of PayFlex as a base client's card in payment projects of the company ("Petrol Plus ", "Bonys Plus"). According to memory size, a number of individual "purses" for services, bonuses and other information can be located on a card. It allows to choose exactly those card modifications, which maximum correspond to business-requirements of a customer.