Powered by 18 V Lithium-Ion slide-style battery, Model XDT09M features BL™ Brushless Motor that delivers full 1,550 lb-in. of max torque in 3rd speed setting. Quick-Shift Mode™ automatic electronic controller downshifts and reduces rotation and impact speed prior to driving screw into place, minimizing thread stripping and screw breakage. Three-speed power selection switch (0-1,100 / 0-2,100 / 0-3,600 rpm and 0-1,100 / 0-2,600 / 0-3,800 ipm) provides precise fastening control.