The Makita HM0871C AVT SDS Max Demolition Hammer is fitted with electronic speed control for maximum productivity and long life carbon brushes for maximum output. It has a hammer only action and has been developed for SDS-Max Bits. The tool is fitted with a variable speed trigger for more control and has been double insulated for added safety. It is fitted with the unique AVT Anti Vibration Technology design. That works by employing the pneumatic pressure created in the drill's hammer piston chamber to move a counter balance in the opposite direction to reduce the impact vibrations at the steel point. This dramatically reduces vibration. Specification Input Power 1,100 Watt. Impact Rate 1,100-2,650/bpm. Impact Energy 7.6 Joules. Weight 5.6kg. Vibration Chiselling 8 m/sec. Vibration K Factor 1.5 m/sec. Noise Sound Power 97 dB(A). Noise Sound Pressure 86 dB(A). Noise K factor 3 dB(A).