Energize III Brake Control comes with the new exclusive Quik-Connect feature and is for trailers with 2 or 4 electric brakes. Contains a patented pendulum sensing device using Hall Effect Technology to automatically monitor and measure tow vehicle deceleration to provide smooth proportional trailer braking. Reacts instantly to any change due to brake pedal effort to apply trailer brakes at the same rate as the two vehicle brakes. Has a fully adjustable gain setting wheel. A 12 volt output is provided with manual lever activation. When the manual lever or trailer brakes are applied, the trailer and tow vehicle stoplights are automatically operated. Energizer III brake control is compatabile with all with all electronic systems such as cruise control and ABS. Has easy adjustment and standard 4 wire hookup. A 5 year limited warranty is included.