Upgraded Motor-10000 Sharpening Times heavy duty electric pencil sharpener with upgraded stronger motor, this electric pencil sharpener can sharpen over 10000 times in only 3-5 seconds with ease. Children are supported for operating alone without "hum" noise even too much force is applied because of its auto-stop and protection mechanism. Strong power and sharp helical bladeIt is faster, more durable and powerful than any other helical blade sharpeners due to its bigger and stronger helical blade and motor. Our classroom pencil sharpener has no issues after sharpening 200 pencils at a time. Colored Pencil SharpenerOur classroom pencil sharpener is great for graphite and colored pencils, such as Prismacolor Premiers, Derwent, Verithins, Faber-castell, Koh-I-Noor Progresso. Please note that it is not recommended to sharpen SOFT CORE pencils as it may cause jams in blade. Auto-stop and Power-off protectionThis plug in pencil sharpener with Pencil Saver feature prevents oversharpening. the pencil stops automatically when it reaches the desired sharpness. It doesn't keep sharpening and causing the waste of pencil. In addition, electrical pencil sharpener stops shaving when bin is removed to ensure safety.