Brushless motor requires no brush changes. Brake stops wheel in 2 seconds or less (on average). Kickback Brake (paddle switch) 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 movement of the grinder and shut the grinder off. Features E-Switch Protection - The ON/OFF trigger switch has a no-volt release function. In the event of a power outage or other unexpected shut down， the trigger switch will need to be cycled (turned off and then on) to restart the tool. Two-stage trigger requires two actions to activate the tool. Includes grinder， hex key， side handle， 4-1/2 In. Type 27 guard， inner and outer flange. Tool Only - battery and charger not included.