Couple of other notes from the website:
Low Variable Speed Capability - 250 RPMs drill speed keeps even the biggest bigs from burning up.
I'm not sure how big the biggest bigs get. Good to know they won't burn up whatever they are.
Intelligent, Adaptive Power Delivery - Draws only the power needed to maintain a selected speed under load, using up to 80% electricity.
Ok, where does the rest of the power come from if it's not electricity? And 80% is the maximum usage of electricity, we have no idea what the minimum is or what the maximum for the other mystery power source will be.