Makita-built brushless motor delivers 3,600 Max RPM and 1,590 in.lbs. of Max Torque Rear handle positioned 4-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 applications L.E.D. light ring provides superior 360° illumination helps eliminate shadows and illuminate a larger area Additional one-touch 4-speed power selector button under the chuck for added convenience Quick-Shift Mode uses the brushless motor’s electronic controls to find the best balance of speed and torque for each application for more efficient fastening Assist Mode (A-mode) feature helps eliminate "screw cam-out" and "cross threading" by driving at low speed until tightening begins Two Tightening Modes (T-mode) for faster tightening of self-drilling screws in thick or thin gauge metal; helps prevent damage to the screw or workpiece Reverse rotation auto-stop mode stops rotation and impact when fastener is loosened adequately Designed with dual ball bearing chuck to reduce bit wobble and run out