Bowthruster.

[Symphony]

Think he means "switches" - one letter makes all the difference.

[Salty]

.......... I assume that inside this just swithes the +red to either yellow or white

Yes, inside the receiver the circuitry switches the positive signal current to either the white or yellow wires in order to operate the up or down solenoids. The solenoids themselves switch in the heavy current in the required direction to the windlass to drive it either up or down on demand.