Endeavor Brake Control by Hayes Lemmerz is the top of the line in brake controllers. Able to sense deceleration of the tow vehicle during braking. An internal sensor measures the amount of deceleration and sends a proportional amount of power to the trailer brakes. Excellent brake reponsiveness is provided by the adjustablility of the initial turn-on voltage and maximum output. This Endeavor trailer brake box has a digital display that allows you to choose either percent of power, current or voltage. A microprocessor allows all your settings to be saved for added convenience. The smart controller provides several dianostic tools to help troubleshoot any towing problems: *current limit *short circuit *no connection *hazard flash *blue fault wire Brakeman Brake Controller can handle up to 4 axles and can also work with hydraulic/electric actuators. A Power Boost feature allows you to select a 15%, 20%, or 25% increase if needed. Includes a limited lifetime warranty.