(Tool only- no batteries, no charger) Best in class power-to-weight ratio - High performance 4-pole motor at 4lbs (tool with battery). Superior ergonomics - Best handling with slim grip for reduced fatigue in extended use applications. Flexible Power System (FPS) - Compatible with Fat and Slim Pack batteries. Electronic Motor Protection (EMP) - Protects motor from overload. Electronic Cell Protection (ECP) - Protects batteries from overload.