New 3D multi-flex head for constant contact with the skin. Range of motion: up and down, left and right, forward and backward 13,000 cycle per minute magnetic linear motor for a smooth and powerful shave Japanese blade technology: features their sharpest 30 degree Nanotech blades Exclusive stubble sensor: intelligently detects differences in beard density, and adjusts the cutting power for maximum gentleness. Curved arc blades follow the natural contours of the face