Kyocera Electric Fine Sharpener with Fine Ceramic Whetstone and Ultrasonic Vibration for Metal Gardening and Other Metal Includes Knife Requires Two

[Sonic electric type for quick sharpening] Quick sharpening with ultrasonic vibrations of approximately 150 times per second [Can sharpen a variety of blades] In addition to knives, it can also sharpen sickles, gardening scissors, nippers, and other blades. [For metal knives] Ceramic knives cannot be sharpened. Batteries (2 AA alkaline batteries required) sold separately. Size: Main unit/20.2 x 5.7 x 3.8 cm, Weight: 135 g, Country of origin: China Materials: Grindstone: Fine ceramics, Body: ABS resin (heat resistant to 70°C) and polyacetal, Cover: ABS resin (heat resistant to 70°C) and 12 nylon