Makita XDT09MB 18V LXT BL Impact Driver Kit (Discontinued by Manufacturer) Quick-Shift Mode selector has an automatic controller that downshifts and reduces rotation and impact speed prior to driving screw into place BL Brushless Motor delivers 3,600 Max RPM and 1,550 in.lbs. of Max Torque Efficient BL Brushless motor is electronically controlled to optimize battery energy use for up to 50% longer run time per charge Features Extreme Protection Technology (XPT) which is engineered to provide increased dust and water resistance in harsh job site conditions 18-Volt LXT Lithium-Ion 4.0Ah battery BL1840B, features an integrated L.E.D. battery charge level indicator (for MB kits)