ABC&reg; New USB 2.0 Ethernet Adapter 10/100/1000Mbps Free Drive Fast Card ABC is a registered trademark and the only authorized seller of abcsell branded products. Supports Auto MDIX (straight and cross network cable auto-detection);Support s USB full and high speed modes with bus power capability Supports both full-duplex and half-duplex operation in fast ethernet Female RJ45 jack supporting Auto MDIX;System requirements: Windows XP/Vista/7/8, MAC OS/Linux Embedded 20KB SRAM for RX packet buffering and 20KB SRAM for TX packet buffering