This auction is for the rare Apple Macintosh Ethernet Twisted-Pair Transceiver Adapter Cable. Part number is M0437. This is a beige adapter box with a yellow activity LED indicator that shows the status of real-time networking connections with supported LaserWriter printers, Macintosh desktop and Macintosh portable systems that have an on-board AAUI Ethernet Connector. The other side features an ethernet RJ-45 connector. This cable is approximately 18-feet in length. Use a standard RJ-45 ethernet cable to connector the networking devices to this adapter for connectivity features. Please check the configurations of your Apple networking adapters and ethernet cards prior to purchase to verify compatibility, no returns please.