Like the DGA700 it features the new Makita Active Feedback Sensing Technology which shuts down the tool to protect the user if the rotation speed suddenly slows down. This is coupled with Makita's Automatic Torque Drive Technology which automatically changes the cutting speed according to working conditions, ensuring optimum performance at all times. In addition, both grinders include the well proven soft start system that reduces risk for torque twist on initial start-up, and the electronic current limiter that also shuts down the tool through the electric brake if the drive is snagged. These are coupled with the anti-restart function which requires that the control switch to be returned to the off position and then back to run before the grinder will activate. Specifications Battery Voltage: Twin 18v (36v) Battery Type: 18v LXT Li-ion Disc Size: 230mm (9") Bore Diameter: 22.23mm Max Disc Thickness: 6.5mm No Load Speed: 6,000 RPM Noise sound pressure/power: 88/99 dB(A) Noise K factor: 3 dB(A) Vibration K factor: 1.5m/sec2 Vibration Surface Grinding: 7.5m/sec2 Vibration Disc Sanding: 2.5m/sec2 Features & Benefits Brushless motor Electronic current limiter for overload protection Soft start Anti-restart function Electric brake Active Feedback Sensing Technology Tool shuts down to protect the user if rotation speed suddenly decreases Automatic Torque Drive Technology Tool Automatically changes the cutting speed according to load condition Ergonomically designed handle with soft grip Battery guard Large switch lever with lock off function Contents DGA900Z Cordless Angle Grinder Side Handle Lock Nut Spanner No Battery No Battery Charger No Case.