Sharpen 10000 Times Without Wearing out This heavy duty electric pencil sharpener is a must for teachers or anyone who has a heavy use on pencil sharpeners. With upgraded stronger motor, this electric pencil sharpener can sharpen over 10000 times in only 35 seconds with ease. You will get a sharp and beautiful pencil point each time. Please dont push the pencil too hard when sharpening, or it will make hum noise and not sharpen pencils. UL Listed Electric Pencil Sharpener Our classroom pencil sharpener is UL listedModel NoS230 and has no issues after sharpening 100 pencils at a time. It is faster, more durable and powerful than any other helical blade sharpeners due to its bigger and stronger helical blade and motor. Ideal for kids, teachers, students, engineers, children, artists, and anyone who needs a longlasting heavy duty pencil sharpener Pencil Sharpener for Colored Pencils and Graphite Pencils This professional pencil sharpener will start sharpening automatically when you insert a pencil. Take out the pencil when the motor sound changes and the resistance of sharpening decreases. Great for graphite and colored pencils, such as Prismacolor Premiers, Derwent, Verithins, Fabercastell, KohINoor Progresso. Please note that it is not recommended to sharpen SOFT CORE pencils as it may cause jams in blade. Commercial Pencil Sharpener High efficiency, fast speed and heavy use make it an industrial and commercial pencil sharpener. It has two safety features. The pencil sharpener will stop working when the shavings box is removed or not closed tightly. When sharpening too many pencils at a time, it will overheat and stop sharpening. Nonskid food pads at the bottom make it more stable to sharpen. Corded Electric Pencil Sharpener This AFMAT electric pencil sharpener comes with a 120V US wall plug, which is easy to use. Just plug in and insert the pencil horizontally. Take out the pencil when the motor sound changes.