Smith’s, the leader in innovative sharpening technology, is proud to offer an electric knife sharpener that incorporates both manual and mechanical sharpening elements. This unique combination provides a broad capability to easily sharpen dull blades and maintain razor sharp edges. The sharpening wheels on your Smith’s Electric/Manual Knife Sharpener are made from bonded synthetics. The synthetics used are selected for their ability to guarantee longer wheel life, uniform cutting, and minimum heat build up, so that de-tempering of your blade does not occur. Our wheels are manufactured according to strict tolerances in order to ensure the same high quality on each and every wheel that Smith's makes. The crossed ceramic rods put the final finished edge on your blade. Crossed ceramic rods create a pre-set sharpening angle that lightly hones both sides of your blade at the same time; thus, putting a polished, razor-sharp edge on your knife. Also, use the crossed ceramic rods for a quick touch-up of already sharp knives. Just a few, quick pulls through the sharpening slot is all it takes. Smith’s recommends always using the ceramic rods for final edge honing after you sharpen using the synthetic wheels. Again, just a few pulls through the sharpening slot is all it takes. BUYERS OUTSIDE THE USA, PLEASE NOTE: This Electric sharpener is designed to use 120V / 60Hz electric Voltage. If your country uses a different current, you will need to use an electric converter to convert it from 120V to a Higher Voltage. Failure to do this will harm your electric sharpener and voids the manufacturer's warranty.