Double Hole Design: The pencil sharpener has 2 hole sizes (diameter 6-8mm and 9-12mm), giving you more choices to sharpen pencils (#2, HB), colored pencils and other pencil shapes (e.g. triangular pencils). Perfect for students, staff, artists, designers, architects and carpenters, etc.\ Sharpens pencils automatically and quickly: The electric pencil sharpener is equipped with a high-performance motor and a compatible with sharp blade, which can automatically and perfectly sharpen pencils in just 3-5 seconds. Comes with four spare blades so you don't have to worry about buying new ones.\ Dual operation: The electric pencil sharpener can be powered by USB or 4 AA batteries (batteries not included), so you don't have to worry about the battery running out.\ Note: To ensure there is enough power when sharpening the pencil, we recommend using a USB cable for power supply.\ Child-safe design: The pencil sharpener starts working when the pencil is clamped and stops working when it is finished and the pencil is released. There is no protection against damage if the razor blade is removed or installed incorrectly. Don't worry about your child being hurt by the sharpener.\ Easy to clean: The sharpener is equipped with a large chip box, so you don't have to worry about chips getting everywhere. Use a brush for quick cleaning. The transparent chip box is convenient for observing the chipping performance and cleaning it in time. Perfect for home, school, classroom and office