I can just quickly insert a pencil on the top and it will sharpen it perfectly in no time. The shavings collect on the side portion that you can remove to empty. It's a good lightweight compact sized design so I consider it rather portable (as long as you will have access to a power outlet wherever you take it.)
This sharpener is definitely colored pencil safe. I personally tested it with several different brands of colored pencil to make sure and got a great sharp un-broken tip every time. I even got inspired and started drawing.