FEATURES: DEWALT XR FLEXVOLT ADVANTAGE delivers up to 77% more power. Brushless motor for increased efficiency and runtime. A unique electronic module with pack identification technology enables the tool to recognise when an XR FLEXVOLT battery is attached and unlock even more power. The combination of XR FLEXVOLT battery and brushless motor technology give this grinder market-leading performance. The DCG409 delivers a no-load speed of 9000 rpm to deliver ultimate performance. Part of the Perform & protect range of tools, the DCG409 features an electronic clutch that reduces reactionary kickback in the event of a pinch or stall. An automatic brake system cuts off the accessory wheel?s motion when the trigger is released. SPECIFICATIONS: Power Source: Battery. Power Voltage: 18 V. Battery Capacity: 6.0 Ah. Battery Chemistry: Lithium-ion. No Load Speed: 9000 RPM. Disc Diameter: 125 mm. Spindle Thread: M14. Switch type: Slide. Hand/Arm Vibration (Grinding): 8.3 m/s?. Uncertainty K 1 (Vibration): 1.5 m/s?. Hand/Arm Vibration (Sanding): 2.6 m/s?. Uncertainty K 2 (Vibration): 1.5 m/s?. Sound Pressure: 85 dB(A). Sound Pressure Uncertainty: 3 dB(A). Weight (incl. battery): 2.8 kg. Quick Change Flange: true. Supplied in Kitbox: true. Brake: true. Clutch: true. Perform and protect: true.