Replacement RJ45 dongle for 10/100BaseT network card. It is compatible with the following 3COM PCMCIA NIC models: 3C574TX, 3C575TX, 3CCFE574BT, 3CCFE575BT, 3CCFE575CT, 3CXFE575BT, 3CCFEM556B, 3CCFEM656, 3CCFEM656B, 3CCSH572B. (Connectors: PCMCIA to RJ45 Female; Length: 6 Inches)