Fast Effient Last for years Plug the pencil sharpener into a 120 V wall socket or power strip. If your voltage is higher than 120V, please use a converter to avoid burning out the machine. Insert a pencil (diameter within 11mm) and push it with a little pressure, it starts to work automatically. The pencil sharpener will auto stop when the pencil is sharpened well. Take out the pencil and you will get a perfect sharp point. Yes! Yes! Yes! Yes! Yes! This electric pencil sharpener fits for 6-11mm standard pencils of various shapes: round, hexigonal, triangular. This classroom pencil sharpener will auto stop when the pencil is sharpened well. No wasting pencils anymore. This pencil sharpener can sharpen 10000 times without wearing, which can last for years. Teachers must have. The sharpening speed is super fast. Only 3 seconds for a new pencil and 1 second for a dull pencil. This pencil sharpener is super easy to use. Just plug it into a 120V wall outlet. Perfect for school, home and office. Note: If the shavings box is not installed in place, the pencil sharpener will not work for safety concern.