Many older boats have masts that are wired with a two conductor wire going up to the masthead. In the past it was impossible to have both Tricolor and an Anchor light because you only had a single +/- going up to the masthead and down to the switch panel.
Since LED's ostensibly are just diodes, namely, one-way streets for electrons this is no longer an issue.
This nifty little switch is a simple DPDT switch that is wired to reverse the polarity of your existing two-conductor mast wiring.The TriAnchor is designed to accept +/- or -/+ giving you the Tricolor or Anchor light function respectively
If you have any questions about how this works, please feel free to call. 631 754 1945. We'll be glad to walk you through the theory.