[ERGONOMIC DESIGN]Our diamond steel knife sharpener has a 2-stage sharpening system that can sharpen your knives with exhaustive sharpness. The first stage of diamond sharpening repairs and straightens damaged blades and the second stage restores and polishes cleanly. Various charging methods: household sockets, power banks, computer usb, etc.Please note that the charger is under the base of the product, you can see it by opening that cover. [EASY, SAFE AND UNIVERSAL USE]Our knife sharpener kit is easy to use. Simply place the knife in the sharpening slot and enjoy your new sharpening in seconds. It is also safe to use and works for all types of knives, including high-quality ""hard"" steel knives. (Please pull the knife several times in the direction of yourself. Be careful not to pull back and forth, it will damage the knife sharperener.) [RECOVER THE KNIVES YOU DON'T USE] Why spend more money buying a new set of knives With our knife sharper, you can recycle your old, boring knives and bring them back to life. Our kitchen knife sharpener is suitable for professional ham knives, kitchen knives, etc. [PROFESSIONAL KNIFE SHARPENER]Forget about other sharpeners. If you are looking for a high quality, reliable knife sharperener machine, this is the best on the market. This knife sharperner will keep knives constantly sharp. Your kitchen should not be without our smart knife sharpener [100% SATISFACTION SERVICE]you will love our knife sharpener but if you are not satisfied with the product, we give you a no-quibble return service. TIPS: Please fully charge the sharpener before using it for the first time.