The Neptune Systems Apex 2-Channel Dimming Cable (DIMCAB2) connects two channels of 0-10V dimmable LED lights to your Apex System or Advanced LED Dimming Module – VDM. This cable has a RJ45 plug on one end and bare wires on the other that must be connected in the manner recommended by your LED manufacturer. If you have four colors of LED that you want to dim, then you will need to buy two of these cables.