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WingMAN 500 Interface Station. You can interface ProLink 500 wireless with some wired systems including PortaCom and other 2-wire party line unbalanced systems using WM-500 - please check with your wired system manufacturer. (When using ProLink 500 with a wired PortaCom system, substitute the WingMAN for the Master remote. The ProLink 500 Master will not work when the WingMAN is in use.)