This proportional brake controller keeps it simple with intuitive controls that are easy to use. Includes a large digital LED display, fingertip gain control, a slide-bar manual override, and built-in safety features. in the USA Specs: Application: trailers with up to 2 axles (4 brake assemblies) Compatible with electric brakes only Dimensions: 6-1/2" long x 3" wide x 1-5/8" tall Mounting angle: -35 degrees