DEWALT XR 4.5-in 20-Volt Max Paddle Switch Brushless Cordless Angle GrinderDEWALT brushless motor delivers up to 57% more run time over brushed Brake stops wheel in 2 seconds or less on average 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 movement of the grinder and shut the grinder off E switch protection is an on off trigger switch that has a no volt release function in the event of a power outage or other