Slide type on/o switch, Anti-restart function and Electric Brake. Kickback user protection; shuts down the tool to protect the user, if the rotation speed suddenly slows down (e.g. kickback). Automatic speed control : Automatically changes the cutting speed according to load condition for an optimum operation. Handles heavy load with Excellent Cooling Function. High eciency and More work amount by Brushless DC motor Battery Fuel Gauge. Extreme Protection Technology, Electric Brake, Soft Start and Carry Case.