The Cordless Knife & Tool Sharpener uses adjustable angle guides at 15°, 20°, 25° and 30° to sharpen all your knives and tools with 1 unit. Floating backing plates allow belt to stay straight and not burn the blade tip. A ceramic deburr slot puts the finishing touches on the edge. The unit comes with rechargeable lithium ion batteries that provide a continuous runtime of 15 minutes. Quick charge technology delivers full battery charge in under an hour. The Smith's 50902 Battery Powered Knife Sharpener includes 3 abrasive belts (fine, medium, and course).