Primus IQ is a totally proportional electric trailer brake control. This easy-to-set system allows the driver maximum flexibility when determining how the trailer should respond to the brake event. Snap-in dash mounting clip and removable electrical connector allow the unit to be quickly stored or moved to another vehicle when not in use. 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.