The Linksys LNE100TX 10/100 Ethernet PCI Adaptor LAN Card V4.1 is a network card specifically designed for computers with PCI slots. It is widely compatible, and offers a maximum data rate of 100 Mbps and and 100Mbps up. With one Ethernet port, this LAN card is ideal for those looking to enhance their older computer's networking capabilities. Made in Taiwan, this unit is reliable and efficient in providing fast and stable network connections. This is V4.1 of the card hardware.