Replacement RJ45 dongle for 10BaseT network card. It is compatible with the following 3COM PCMCIA NIC models: 3C562, 3C562B, 3C562C, 3C562D, 3C552D, 3C563, 3C563B, 3C563C, 3C563D, 3C589C, (RJ45 cable only, not coaxial), 3C589D, CCE589ET, 3CCE589EC, 3CXE589ET. (Connectors: PCMCIA to RJ45 Female; Length: 6 Inches)