Tekonsha Voyager Electronic Brake Control 5 in.

The Voyager incorporates patented braking sensor by Tekonsha and is the best value you will find for smooth and secure trailer braking. It is compact size and features, like a bicolored LED brake monitor (to assure a complete connection to trailer brakes and give an indication of relative braking power being applied) make the Voyager extremely versatile. Voyager minimizes interference with tow vehicle electrical systems, uses a four wire hook up, has a broad setting range and is compatible with most any vehicle. As braking power is applied, the LED changes color gradually from green, completed circuit, to red, to indicate relative braking power.