this listing is for a Xircom CE3B-100 CreditCard Ethernet 10/100 Adapter PCMCIA NIC Card. This CreditCard Ethernet 10/100 enables a notebook user to connect to high-speed 10/100Mbps Ethernet.  This PC Card auto senses your network speed for seamless 10Mbps or 100Mbps operation. This adapter features advanced power management for longer notebook battery life and supports a wide range of network operating systems including Windows 95/98 and Windows NT.