The FS-6C is a color-changing adapter designed to be compatible with multiple ADJ Followspot systems. Instead of using separate color gels to achieve the desired results, this adapter allows you to choose between red, blue, green, and yellow filters to achieve a variety of different color effects with your Followspot system. With a traditional gel system, you would have to keep track of and remove/replace each gel every time you wanted to change the color of your spot light, but this adapter makes changing color gels a breeze when used with compatible American DJ Followspot systems.