FeaturesQuick-Shift Mode鈩?uses the brushless motor鈥檚 electronic controls to find the best balance of speed and torque for each application for more efficient fasteningBL鈩?Brushless Motor delivers 3,600 Max RPM and 1,600 in.lbs. of Max Torque4-speed power selection (0-1,100/ 0-2,100/ 0-3,200/ 0-3,600 RPM & 0-1,100/ 0-2,600/ 0-3,600/ 0-3,800 IPM) provides precise fastening control for a wide range of applicationsAdditional one-touch 4-speed power selector button under the chuck for added convenienceAssist Mode (A-mode) feature helps eliminate "screw cam-out" and "cross threading" by driving at low speed until tightening beginsTwo Tightening Modes (T-mode) for faster tightening of self-drilling screws in thick or thin gauge metal; helps prevent damage to the screw or workpieceReverse rotation auto-stop mode stops rotation and impact when fastener is loosened adequatelyBuilt-in L.E.D. lights on both sides helps eliminate shadows and illuminate a larger areaCompact and ergonomic design at only 4-9/16" longWeighs only 2.8 lbs. with battery (BL1820B) for reduced operator fatigue