ACR122U NFC reader is a USB-connected contactless smart card reader based on 13.56 MHz RFID technology. It complies with the ISO/IEC 18092 Near Field Communication (NFC) standard and supports IC cards, ISO 14443 Type A and Type B cards, and all four types of NFC tags. Designed to meet PC/SC standards, the ACR122U functions as a plug-and-play USB device, enabling compatibility with various devices and applications. It features a USB full-speed interface (12 Mbps) with data transfer speeds up to 424 kbps, supporting efficient read and write operations. The operating distance can reach up to 5 cm, depending on the type of contactless tag. For enhanced security, the ACR122U can be integrated with an ISO 7816-3 card slot. The reader is also available in module form, allowing easy integration into larger systems such as terminals, access control units, and vending machines. This NFC reader is suitable for personal identity authentication and online micropayment transactions. It is widely used in access control, electronic payment, electronic ticketing (events and public transportation), toll collection, and network authentication. The ACR122U can be used with an optional base for optimal positioning, allowing users to easily scan contactless cards or NFC-enabled devices. Applications include online banking, e-commerce, e-wallet balance inquiries, network access, customer loyalty programs, identity verification, ticketing, parking systems, automated toll collection, public transit, access control, attendance systems, vending machines, contactless telephones, and supply chain management. Color: white. Material: plastic. Package includes: 1 x NFC card reader. Light and display settings may cause slight color variations. Measurement tolerance: +/- 1-3 cm.