How are manual knife sharpeners different from electric?
The most obvious difference is that the user does the work and sharpening takes somewhat longer. The sharpening can be back and forth or one directional. Each stage sharpens both sides of the knife blade simultaneously. The design of the manual sharpeners actually makes them more versatile, easily utilized by both left-handed and right-handed users. Manual sharpeners are, of course, less expensive.
