This 3-stage electric knife sharpener is fast and easy to use. Works on smooth, serrated, Asian and sporting knives. The angle guides keep you within a perfect 15-20 degree angle, so there's no guesswork. Stage 1 at a 15% angle for Asian knives and Stage 2 at 20% for American and European knives hones cutlery to hairsplitting sharpness with diamond coated disks. Revolutional Stage 3 stropping/polishing disk finishes the job with a flawless edge. Lubricant-free so it's a joy to sharpen knives. 3 year limited warranty. Compact for easy storage.