Superior Torus LED 2100 Independent Flashing Lightbar comes in 4 different standard configurations. The configurations include 3-up (TRS3) and 4-up (TRS4) directional Torus lightheads, 6-up LED corners. LIT3KIT and vehicle mounting adapter included with standard bars, just include vehicle make and model/year when ordering. These lightbars do not require a central controller. These bars have a dimming mode and clear lens are standard. The Plus models come with the ArrowStick technology and corner cruise. See the pictures for the differences in the 4 varieties.