1. SIMPLE, SAFE, AND UNIVERSAL USE Our sharpener set is easy to use. Simply place the knife into the sharpening slot and enjoy a renewed edge in just seconds. It is also safe to operate and suitable for all types of knives, including quality 'hard' steel knives. (Please pull the knife toward you several times, ensuring not to move it back and forth.) 2. 3SPEED SETTING AND BUILTIN Three levels can be adjusted for , medium, and low precision. The builtin capacity allows continuous sharpening of more than 50 knives. 3. ERGONOMIC DESIGN Our diamond steel sharpener features a 4stage sharpening system, enabling you to achieve an extremely sharp blade edge. The first stage of diamond sharpening repairs and straightens damaged blades, while the second stage performs a clean restoration and polish. Comfort is also considered in the design: the quality suction cup at the base provides a stable grip, making it comfortable and easy to hold. 4. STORAGETYPE POWER CORD Multiple charging methods: household power outlets, mobile power sources, computer USB, etc. Please note that the charger is located under the product base and can be seen by opening the cover.