BL Brushless motor delivers 1,200 in.Lbs. Of max torque in an ultra compact design Assist mode (a-mode) feature helps eliminate "screw cam-out" and "cross threading" by driving at low speed until tightening begins Variable 2-speed (0-1,300/0-3,000 RPM & 0-1,600/0-3,900 IPM) for a wide range of fastening applications Compact and ergonomic design at only 5-5/16" long Weighs only 2.1 lbs. With battery for reduced operator fatigue