Tekonsha Prodigy Brake Control for GM Vehicles ('99-'02) Includes universal wiring harness to connect brake controller to vehicle tow package. Applies power to the trailer brakes in proportion to vehicle's deceleration. No level adjustment necessary - it adjusts itself to varying terrain as you drive. The only inertial control that works proportionally in reverse - great for backing into tough spots. Digital display depicts voltage delivery to trailer during braking.