SMC EZ Card 10/100 (SMC1244TX V2) is a high-performance plug-and-play 32-bit PCI 10/100Mbps Fast Ethernet adapter that utilizes the latest chipset technology and 32-bit bus mastering mode. The dual-speed adapter automatically senses and switches to 10 Mbps or 100 Mbps (20 Mbps or 200 Mbps in full-duplex mode) and connects to Ethernet/Fast Ethernet networks using a single RJ-45 connector. Installation could not be easier: just plug it into your computer, load the driver, and it's ready to go.