Viare Automatic Electric Pencil Sharpener for Art Colored Pencils,Battery & USB-Operated,white Automatic safety lock function function-The pencil sharpener stops once the shaving tray is removed. Multy Powered - Can be powered by USB (wire included) or 4 pieces AA batteries (not included). Come with One Extra Replacement Sharpener Core The product is suitable for standard wooden pencil (6.5-8mm in diameter) This Automatic Electric Pencil Sharpener, is a must add to your office desk accessories or office supplies kit. It's space saving, compact and universal design, makes it a professional addition to your desk or table. With it's non-skid base, you can single-handedly sharpen pencils, great for those who like to multitask. Guarantee your work success with new sophisticated equipment.