The MIFARE Classic family covers contactless smart card ICs used in public transport, access management, loyalty cards and many more. 
Fully compliant with ISO/IEC 14443 Type A, it is available with 4 KB memory, and 7 byte or 4 byte identifiers.
Key features and benefits
>Fully ISO/IEC 14443Type A 1-3 compliant, ensuring a broad marketplace of solution developers and providers
> Available with 7 byte unique identifier (7B UID) or 4 byte non-unique identifier (4B NUID)
> Versatile product portfolio, offering an optimized price-performance ratio
> 4 KB EEPROM
> Reduced infrastructure costs due to card and reader compatibility across all generations
> Memory access conditions freely programmable
> Many companies with commercial products, enabling a broad and competitive supply chain
>Personalization options supporting flexibility within 4 byte- and 7 byte UID infrastructure (7B UID version only)
> Fast time-to-market
Key applications
> Public transportation
> Electronic toll collection
> Loyalty cards
> Event ticketing
> Car parking

Nearly all proximity card SMEs (Small and Medium Enterprises) will know now that you've a huge demand from customers for
credit / bank card processing devices, and also since Chip and PIN technology came to exist retailers without the appropriate card processing terminals have forfeit on important business. The charge card will almost certainly become the payment processing selection of individuals before very long and it's occurring already.