The Vintage Kelsey Hayes Automatic Electric Brake Controller is a classic piece of American-made automotive hardware. This specific model, 56943, is designed to control electric brakes, making it a crucial component for towing and trailer operations. The set includes the controller, original box, and manual, adding to its collectible appeal for vintage car enthusiasts and automotive collectors alike. Keep in mind that this untested item may require restoration or servicing to ensure optimal functionality for modern use.