Built in no-volt release gives protection against accidental start ups when new battery is installed. TWO STAGE TRIGGER requires two actions to activate tool. KICKBACK BRAKE engages when a pinch, stall, or bind-up event is sensed and the electronic brake engages with maximum force to quickly stop the wheel, reduce the movment of the grinder and shut the grinder off. Constant Clutch and E-Clutch protects from kickbacks, cuts and wheel bursts. Ergonomic slim body with rubber over-mould for improved comfort and control. Braking time of < 2 seconds when the trigger is released to help reduce accidental contact and injury. Compact gear case for increased access to tight spaces and excellent cutting depth. Slide switch provides less user fatigue. Tool only (battery and charger not included).