These 3-pin spacer cables are used to extend the distance between the power supply and a Power-T when injecting power into the system for runs that are longer than 200 ft. If the power supply outlet isn't within distance to a Power-T, 3-pin spacer cables can be used to create an extension cord. 3-pin spacer cables come in lengths of 5 ft and 10ft, and connect end to end in series. 3-pin Spacer cables only come in color black.