Knife Sharpener Professional 2-Stage Electric Knife Sharpener for Kitchen Knives with Quick Sharpening and Polishing Function, Easy to Use for All Kinds of Kitchen Knives One-button operation with two-stage sharpening system featuring two sets of four sharpening ports for coarse and fine grinding. Two-stage high-speed sharpening restores dull knives to like-new sharpness, improving cutting efficiency. Rechargeable and cordless design allows convenient use anywhere without being restricted by wires. Hidden charging compartment at the base includes a charging cable that stores neatly inside; charging complete when indicator light is fully illuminated. Usage: 1. Turn on the switch and hold the sharpener with one hand, adjusting to the suitable speed setting (I for medium-low speed, II for high speed) based on your knife type. 2. The sharpener includes coarse grinding and fine grinding stages. Begin with coarse grinding followed by fine grinding, or use fine grinding alone for maintenance. 3. Hold the knife in your right hand and insert the blade tip into the sharpening slot, then pull gently backward toward the handle at an even pace. Wide range of compatible knife types: Coarse grinding slot ideal for edge restoration; fine grinding slots designed for regular maintenance. Suitable for table knives, scissors, fruit knives, vegetable knives, kitchen knives, chef's knives, and more. Not suitable for serrated knives or ceramic knives.