None Tekonsha Primus IQ RV Trailer Brake Controller

Works proportionally in reverse. No level adjustment necessary, adjusts to varying terrain as you drive. Digital display shows Voltage to trailer during braking. Boost feature allows for customized braking. Pre - assembled wire harness for simple hook - up & quick disconnect. Diagnostic features incorporated in LED display. Electric trailer brake control for up to 3 braking axles. Includes brackets & plugs. Limited Lifetime Warranty (some conditions apply).