DEWALT 20V MAX* Angle Grinder Tool, Tool Only (DCG413B), Black, Yellow

From the manufacturer

DEWALT grinder’s 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 metal grinder and shut the grinder off.
Features E-Switch Protection – When 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 tool.
Two stage trigger requires two actions to activate tool.