Mechanical 2-speed transmission (0-500 and 0-1,900 RPM) for a wide range of drilling and fastening applications BL Brushless motor delivers 440 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 Makita XFD131 18V LXT Lithium-Ion Brushless Cordless 1/2" Driver-Drill Kit (3.0Ah)