Electric Knife sharpener* Efficient and fast grinding: automatic constant speed sharpening, electric knife sharpener equipped with high-speed motor, only need 10 seconds to sharpen the knife High-quality and durable: The grinding wheel assembly adopts precision grinding bearings, which can run more smoothly and have a longer service life Safe and practical: USB power supply design, stable current, with protective cover, which can effectively prevent metal chips from splashing and hurting people during the sharpening