The CURT Spectrum trailer brake controller provides powerful brake operation while maintaining a clean, consistent OE look and feel on the dash of your vehicle. It is comprised of a main module and a separate user interface. This interface is a simple rotary knob with a push-button and ten tri-color LEDs to control and monitor all trailer brake activity. This package includes the replacement knob assembly for the Spectrum. It comes with the knob, harnesses, and mounting hardware. It is equipped with factory-wired connectors for easy, plug-and-play installation. Note, the main module is not included in this package.