Powerful 11.0 AMP motor; 1,350-2,750 BPM to handle the most demanding applications.Constant speed control automatically applies additional power to the motor to maintain speed under load to complete the most challenging jobs.Soft start suppresses start-up reaction for more control and better accuracy.Variable speed control dial enables user to match the speed to the application for greater versatility.L.E.D. service light notifies the user approximately 8 hours before the brushes need to be replaced.L.E.D. power light indicates switch failure or cord damage.Torque limiting clutch engineered to prevent gear damage by automatically disengaging gears if the bit binds.Sequential impact timing delivers timed hammering during rotation to minimize overlapping bit impacts, resulting in up to 50% more drilling efficiency.Makita Motor Advantage engineered with field core interlocking steel laminations, dual ball bearing armature and more copper commutator bars, increasing energy transfer efficiency for more.power and longer tool life.Automatic brush cut-off protects commutator from damage for longer tool life.2-mode operation for "Hammering Only" or "Hammering with Rotation".Lock-on slide switch for continuous operation ("Hammering Only" mode).Externally accessible carbon brushes for greater serviceability