This vertical pencil sharpener was designed with powerful, stall-free sharpening and convenient, desktop space-savings in mind. Each unit features Bostitch HHC™ cutter technology for a 4x longer cutter life and thermal overload protection for increased motor life. SharpStop™ technology is also included in each sharpener to automatically shut off the unit's motor when it detects that a pencil has been perfectly sharpened. This feature prevents over-sharpening and extended pencil life! Compatible with standard pencils and colored pencils alike, this vertical pencil sharpener is perfect for office settings, classrooms, home offices, or even artists' studios. The large shavings tray has an integrated safety switch that prevents operation when removed, a great feature for school environments. This vertical blue sharpener is the only one you'll ever need - only from Bostitch Office!