The Makita DGA900 is a high powered 230mm (9") cordless angle grinder powered by two 18V Li-ion batteries in series. The 36v DC motor delivers more power and run time without leaving the 18v Lithium-ion platform. Featuring Automatic Torque Drive Technology (ADT): Automatically changes the cutting speed according to load condition for an optimum operation. Active Feedback Sensing Technology (AFT): Shuts down the tool to protect the user if the rotation speed suddenly slows down. Features Brushless motor. Electronic current limiter. 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 .