[ERGONOMIC DESIGN]Our diamond steel sharpener has a 4-level sharpening system, which can sharpen your knife edge extremely sharply. The first stage of diamond sharpening repairs and straightens the damaged blade, and the second stage performs clean restoration and polishing. Comfort is also considered in the design: the high-quality suction cup at the bottom provides a firm base, comfortable and easy to grasp. [STORAGE TYPE POWER CORD]Various charging methods: household sockets, mobile power supplies, computer USB, etc. Please note that the charger is located under the product base and you can see it by opening the lid. [3-SPEED ADJUSTMENT AND BUILT-IN BATTERY]High-end, mid-range, and low-end 3 levels can be adjusted. Built-in large-capacity battery can continuously sharpen more than 50 knives. [EASY, SAFE AND UNIVERSAL USE]Our sharpener kit is easy to use. Just put in the sharpening slot and enjoy a new sharpening in a few seconds. It is also safe to use and is suitable for all types