Easy, safe, universal use: The sharpener kit is simple to operate. Insert the knife into the sharpening slot and you can get a refreshed edge in seconds. It is safe for all knife types, including hard steel knives. Usage tip: pull the knife in one direction for several strokes, avoiding a backandforth motion. 3speed adjustment and builtin battery: Three levels (, mid, low) can be selected to suit different knives and blade conditions. The builtin largecapacity battery can continue sharpening for many uses, delivering more than 50 knife sharpenings on a single charge. Storagetype power cord and versatile charging: The charger is stored under the product base and accessible by opening the lid. It supports charging from household outlets, portable power supplies, or computer USB ports. Ergonomic design with a 4level diamond sharpening system: The sharpener uses a fourlevel diamond sharpening process to produce a very sharp knife edge. The first stage repairs and straightens damaged blades, while the second stage performs clean restoration and polishing. The base features a quality suction cup for a firm, stable grip, and the unit is designed for comfortable handling. Specifications and compatibility: Diamond steel sharpener with a 4level sharpening system. Suitable for all knife types, including hard steel blades. Builtin battery supports extended use; charging options include household power, portable USB power banks, and computer USB ports. The charger is located under the base and accessible by lifting the lid. Practical use scenarios: Everyday kitchen maintenance: quickly refresh chef's knives, paring knives, and utility knives during meal prep to maintain sharp, precise cuts. Outdoor or travel use: convenient sharpening on camping trips or in catering setups where USB power or a power bank is available. Small workshop or professional kitchen: keep multiple blades sharp with a portable, selfcontained sharpener that provides stable operation and reliable results.