The DGA900Z angle grinder from Makita is driven by two 18V batteries to give you extra power for those more demanding jobs. Brushless motor Electronic current limiter for overload protection. Soft start Anti-restart function. Electric brake Active Feedback Sensing Technology (AFT): Shuts down the tool to protect the user if the rotation speed suddenly slows down Automatic Torque Drive Technology: Automatically changes the cutting speed according to load condition for an optimum operation Ergonomically designed handle with soft grip. Battery guard Large switch lever with lock off function Battery indicators for over-discharge and overheating protection