The Xircom RBE-100 RealPort CardBus Ethernet PCMCIA PC Card Network Adapter is a high-quality Ethernet card designed for use in laptop and desktop computers. With one RJ-45 external interface, this PCMCIA Type II card offers fast 10/100 Ethernet connectivity. It is compatible with various standards including Ethernet, CardBus, and RealPort, making it a versatile option for networking needs. The Xircom RealPort model ensures reliability and performance, making it a valuable addition to any computer system requiring a PCMCIA Ethernet card.