The DMT SONIC Sharpener is an attractive counter model (4 3/8 inch x 3 1/2 inch x 4 3/8 inch ) providing sharpening assist without a plug! Operates on 2 AA batteries. Blade openings accommodate most common sports and kitchen knives. Vibrating sharpening heads facilitate sharpening. Sharpening surface 20mmx30mm (.7874 inch x1.181 inch). Fine diamond (red/600 mesh, 25 micron) for a razor sharp edge. Sharpeners made in USA; other components made in China.Fine diamond for a razor sharp edgeCounter model for kitchen or benchHone knives faster with sharpening assist with 2 AA batteriesVibrating sharpening headsDurable construction will provide years of performance and reliable serviceWARNING: use of this product can expose you to chemicals including nickel which is known to the State of California to cause cancer. For more information go to www.p65warnings.ca.gov.