Tekonsha Prodigy is a technological breakthrough amount inertia-activated brake control. Equipped with a self-adjusting sensing device similar to the one used in guided-missile technology to allow for easy, flexible installation -- from nearly horizontal to nearly vertical -- Prodigy constantly adjusts itself to the position of the tow vehicle. Power-saving mode reduces drain on battery when vehicle is not in use. Pre-assembled wire harness for simple hookup to pre-wired vehicle. Unique pocket-mount allows for flexible mounting options. Quick and easy disconnect feature allows user to remove and store the control when not in use. Pre-wired harnesses are available to fit most newer tow vehicles, allowing virtually instant installation. Made for up to four-axle trailer brake systems. 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. Continual diagnostics check for proper connection, shorted magnet condition, and much more. Exclusive "boost" feature gives users the ability to apply more initial trailer braking power when towing heavier trailers. For 2, 4, 6 or 8-brake trailers.