T5557 is the Atmel company produces the multi-function non-contact identification of R/W integrated circuit, apply to 125KHz frequency range. △Have a password Settings and write protected. Users can set reading way. ป้องกันการชนกัน △Built-in capacitance can mask choice, also can be outside distribution capacity. △The only 64bit serial number, has the traceability. △Read/write data transmission non-contact way T5557 major upgrade replacement early E5550/E5551 chip, now for T5567 upgrade replacement products, widely used in various forms of identification, such as traffic travel, health communication, การศึกษา, entertainment and so on a variety of applications, such as hotel door lock card, health insurance card, campus id, enterprise/factory attendance card, Gas station Gas cards,dining cards, การ์ดเกม, student achievement cards, บัตรโทรศัพท์, movie theaters cards, entertainment cards.