DeWalt DCG415B 20V MAX XR Brushless Li-Ion 4-1/2 - 5 in. Cordless Compact Angle Grinder The Dewalt 20 Volt max xr cordless angle grinder features power detect tool technology to maximize performance with high-capacity xr batteries. The brushless motor delivers 1350 max Watts out and up to 9000 RPM speed. This paddle switch angle grinder is part of the perform and protect product line with kickback brake and the e-clutch system. The kickback brake engages with maximum force to quickly stop the wheel and shut off the grinder when a pinch, stall or bind-up occurs to reduce the risk of damage or injury. The e-clutch system activates in less than a tenth of a second when a pinch/stall is detected, thus shutting down the motor. The e-switch protection requires the trigger switch to be cycled that is turned-off and then on, in the event of a power outage or other unexpected shut down to restart tool.