USB Interface.You can experience the convenience in using ACR122U, with its compact size and the features it offers, 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 14443 Part 4 Type A and B cards, IC Classic, FeliCa, and all four types of NFC (/IEC 18092 tags). The ACR122U is a PC-linked contactless smart card reader/writer developed on the 13.56 MHz contactless technology. By making use of up to 424 Kbps read/write speed for NFC tag access and up to 12 Mbps for USB , ACR122U can efficiently read from and write to contactless cards/tags. It is also PC/SC-compliant which allows interoperability across different applications and platforms. Colour: white Material: plastic Package Contents: 1 * Replicator 5 * Key fob 5 * Card Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.