The Boss STB10160 is a D-Force Straight-Blade Controller ST2 STB D-F. Keep your blade in contact with the pavement with D-Force. D-Force improves scraping performance while backdragging by maintaining a consistent hydraulic downforce powered by a hydraulic accumulator. Operation of D-Force is made simple with a SmartTouch2 Controller with D-Force. Simply pull up to an area for backdragging, put the plow in float mode (either by pressing and holding the down function for 2 seconds or via double tapping of the down function) so the Red LED is displayed on the controller. Double tap the down function a second time to activate D-Force. The controller LED will switch to an Orange color and the power unit will run for a short duration, applying down force to the cutting edge through the lift cylinder. If necessary, double-tapping a second time will run the power unit again. Please note, BOSS recommends using D-Force in backdragging motions only. D-Force is not intended for forward travel.