1. ERGONOMIC DESIGN Our diamond steel sharpener features a 4stage sharpening system that allows you to achieve an extremely sharp knife edge. The first stage of diamond sharpening repairs and straightens damaged blades, while the second stage performs a clean restoration and polish. Comfort has also been considered in the design: the quality suction cup at the bottom provides a stable base and is comfortable and easy to grip.2. 3SPEED SETTING AND BUILTIN Three levels can be adjusted for , medium, and low ranges. The builtin largecapacity can continuously sharpen more than 50 knives.3. STORAGETYPE POWER CORD Various charging methods: household power sockets, mobile power supplies, computer USB, etc. Please note that the charger is located under the product base, and you can see it when you open the cover.4. EASY, SAFE, AND UNIVERSAL USE Our sharpener set is simple to use. Just place the knife into the sharpening slot and enjoy a renewed sharpness in seconds. It is also safe to use and suitable for all types of knives, including quality 'hard' steel knives. (Please pull the knife toward you several times and avoid moving it back and forth.)