Designed for use on any 12 Volt negative ground vehicleFully-adjustable gain setting wheelCombatable with all electronic systems: Abs, cruise, etc.Easy attachment and four-wire hookupFull 12 volt output provided with manual lever activationThe Syncronizer is a brake controller for single and tandem axle trailers equipped with electric brakes. It modulates and controls the current from the battery to the trailer brakes. The longer the brake pedal is depressed the greater the current delivered to the trailer brakes until the preset brake power setting is reached.