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 initiates two-stage knife sharpening with two sets of four sharpening ports for coarse and fine grinding. Two-stage high-speed sharpening restores dull knives to a like-new sharpness, improving cutting efficiency. Ideal for kitchen knife maintenance. Cordless and rechargeable design allows for portable, on-the-go sharpening without the need for wires. Convenient for use anytime, anywhere. Hidden charging compartment at the base keeps the unit compact and space-saving. To charge, open the bottom compartment, remove the cable, thread it through the guide slot, close the compartment, and connect to power. Charging completes when the indicator light is fully illuminated. Usage: 1. Turn on the switch and hold the sharpener with one hand. Adjust to the appropriate speed setting (I for medium-low speed, II for high speed) based on your knife type. 2. The sharpener features coarse grinding and fine grinding stages. Begin with coarse grinding followed by fine grinding, or use fine grinding alone for routine maintenance. 3. Hold the knife in your right hand and insert the blade tip into the designated grinding slot. Pull the blade backward smoothly toward the handle at an even pace. Wide compatibility with various knife types: Coarse grinding slot is ideal for re-edging dull blades, while fine grinding slots are suitable for regular sharpening maintenance. Works well with table knives, scissors, fruit knives, vegetable knives, kitchen knives, chef’s knives, and more. Not suitable for serrated knives or ceramic knives.