It's a rotational sharpener, where you can adjust and choose which length of a point you want. This way, you don't waste pencil while sharpening. You can't use all pencils with this, like Derwent and Caran d'ache, because they are too big. They work well for Polychromos and Prismacolors.
This is a list with all my favorite drawing supplies for beginners. If you want to get started with drawing but don't know what to buy, this list should help you decide what the most important items are.
Remember, you don't need to buy all of these supplies right away. Rather see which supplies might solve any issues you run into in your journey of learning to draw (for example, one issue may be that you are constantly smudging messy media like graphite or charcoal on your hand, and the answer to that may be to buy a big pad of wax paper to protect your paper/hand with).
Start out with the essentials and then branch out from there!
For further reviews or to see these products in action, check out my Youtube Channel , Patreon , and Skillshare !