The Work Sharp Culinary E4 electric kitchen knife sharpener uses controlled speeds and timed sharpening cycles to shape, sharpen and refine all your kitchen knives at the touch of a button. Based on traditional belt sharpening practices, the E4 creates a sharp-as-new edge the same way manufacturers sharpen knives at the factory.Precision sharpening guides, controlled speeds, and high-performance sharpening belts make the E4 knife sharpener easy, clean, and gentle on knives.