USB Full Speed Interface. Experience the convenience of the ACR122U with its compact size and versatile functionality for applications such as payment, access control, time and attendance, and mass transit. Built-in antenna for contactless tag access, with card reading distance of up to 50 mm (depending on tag type). Supports ISO/IEC 14443 Part 4 Type A and Type B cards, MIFARE Classic, FeliCa, and all four types of NFC (ISO/IEC 18092) tags. The ACR122U is a PC-linked contactless smart card reader/writer based on 13.56 MHz contactless technology. With up to 424 Kbps read/write speed for NFC tag access and up to 12 Mbps USB full-speed transfer, the ACR122U efficiently reads from and writes to contactless cards and tags. It is PC/SC-compliant, ensuring interoperability across different applications and platforms. Color: White Material: Plastic Package Contents: 1 × Reader 5 × Key Fobs 5 × Cards Note: The actual product color may vary slightly due to lighting conditions and screen settings. Measurement tolerance: ±1–3 cm.