This LINKSYS EtherFast LAN Card is a high-speed network adapter that operates on 10/100/1000 Mbps networks. It is compatible with PCI slots and features advanced data encryption to ensure secure communications. The card is manufactured by Cisco and comes in a used but well-maintained condition. It supports a variety of operating systems and is easy to install, making it an ideal choice for businesses and individuals looking to upgrade their network capabilities.