1. Easy, safe, and universal use: Our sharpener set is simple to operate. Just place the knife into the sharpener slot, and in seconds, you'll experience renewed sharpness. It's safe to use and compatible with all types of knives, including quality 'hard' steel knives. (Note: Pull the knife toward you several times, avoiding backandforth motion.) 2. Storagetype power cable Multiple charging options: household sockets, power banks, computer USB, etc. Please note that the charger is located under the product base—simply open the lid to access it. 3. Ergonomic design: Our diamond steel sharpener features a 4stage sharpening system for achieving an ultrasharp blade. The first stage repairs and straightens damaged edges, while the second stage cleans and polishes. Comfort is also prioritized: the quality suction cup at the bottom ensures a stable grip and easy handling. 4. 3speed adjustment and builtin capacity: Adjustable for , middle, and lower ranges. The builtin large capacity allows continuous sharpening of over 50 knives.