1. 750/800W Pure Copper Motor: Produce 0-4000 RPM variable speed to meet different requirements and add more durability for drilling and chipping brick, wood, steel, concrete, masonry , wall and other hard materials. Reduce half of loading damage issue as well.
2. Lock Speed Button: Lock button enable you to lock the speed without a constant grip on the trigger to reduce fatigue. 
3. Hammer & Impact 2 In 1: By turning on or off a hammer drill's impact mechanism according to your task, it not only possess a drilling feature, but also works as an impact drill that provides a rapid succession of short hammer thrusts to break through concrete, stone, wood and metal with less effort.