Finally an electric brake control right where it belongs! On the Trailer! No wiring in tow vehicle, no knee knocker unit inside cab, no adjusting, no hassles, no kidding..just drive. It is recommended to have a dealer or installation professional install the Autowbrake. Autowbrake units come with everything needed to install on a trailer. Mounts any direction & angle. Direct wire into junction box on trailer. Works with 1,2, and 3 axle trailers. Operates in Reverse. Will shut down automatically if a cab mounted brake controller is sensed. Key FOB for auto override, testing, and sway prevention. Absolutely nothing inside the tow vehicle. Three settings depending on size of trailer: Low, Medium, and High.