The CURT Spectrum-2 Brake Controller is a fully compatible unit, able to operate up to eight trailer brakes at a time (1-4 axles). It can be used on vehicles with ABS brakes and cruise control and electric over hydraulic, and it works with low-voltage and PWM systems.The interface of the Spectrum-2 Brake Controller is simple but powerful. It is a single rotary knob with a push-button in the centre that allows the driver to adjust brake power output.It is equipped with ten tri-colour LEDs (red, blue and green) to show the automated power output of the control. There is no need for a separate display or additional controls, keeping the dash of your vehicle clean, professional, and uncluttered. Features and Benefits:Motion-sensing accelerometer for highly responsive, smooth stops.Easily accessible manual override with the press of a button.Automatic levelling and calibration eliminate setup requirements.Equipped with a quick plug for easy, plug-and-play installation.Built-in reverse-polarity and short-circuit protection.Clean, dash-mounted, OEM-style user interface with 10 tri-colour LEDs.The main module can be mounted out of sight. Specifications:Includes mounting hardwareKnob outside diameter is 48mmVoltage: 12VUser Manual, click here What is Included:1 x CURT Spectrum-2 Brake Control Important Information:Not what you are looking for? Check out the full range of Brake Control Systems & Parts here.