Powerful 14 AMP motor (730 - 1,450 BPM) to handle the most demanding applications. Constant speed control automatically applies additional power to the motor to maintain consistent speed under load for 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 lights indicate switch failure or cord damage. 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. Extended life brushes are longer for more work between service intervals and less downtime. Automatic brush cut-off protects commutator from damage for longer tool life. Durable blow-molded rolling tool case for safe storage and easy transportation. No hammering when idling helps increase tool life.