1/2 inch Square Drive, Variable 4-Speed, Reversible, Electric Brake, Detent Pin. Brushless DC motor with high power to weight and size ratio. Brushless DC motor generates less heat buildup and is ideal for prolonged use in manufacturing / production applications. Shielded motor suitable for use in high-voltage environments and applications. 4 stage impact power selection ensure precise fastening and prevents damage to fasteners or materials. 3 forward and 3 reverse auto stop modes stop impact and rotation at pre-set levels to ensure fastening accuracy and prevent over/under tightening of fasteners. Variable speed trigger with full speed mode features shorter trigger travel for reduced operator fatigue. eXtreme Protection Technology (XPT) offers maximum protection against dust, debris and liquids for optimal performance in extreme conditions. Battery protection system provides over-discharge, temperature and circuit protection for enhanced performance, battery cycle life and overall battery life. Twin LED job light with pre-glow and after-glow feature and independent on/off switch. Ergonomic soft rubber grip design for vibration absorption and comfortable operation.