18V, LXT, Lithium-Ion, Brushless, Cordless Impact Driver, Tool Only, No Battery Or Charger Included, Quick-Shift Mode Uses Brushless Motors Electronic Controls To Find The Best Balance Of Speed & Torque For Each Application, Brushless Motor Delivers 3,600 Max RPM & 1,600 IN/LB Max Torque, 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, Assist Mode A-Mode, Feature Helps Eliminate Screw Cam-Out & Cross Threading By Driving Low Speed Until Tightening Begins, 2 Tightening Modes T-Mode For Faster Tightening Of Self-Drilling Screws In Thick Or Thin Gauge Metal Helps Prevent Damage To The Screw, Reverse Rotation Auto Stop Mode Stops Rotation & Impact When Fastener Is Loosened Adequately, Built-In LED Lights On Both Sides Helps Eliminate Shadows & Illuminate A Larger Area.