Ofoice Electric Pencil Sharpener with Heavy Duty Blade, Battery/Adapter Operated Automatic Pencil Sharpener for Office, School, Studio Powerful Motor, Stable Operation: Promote efficiency in your office with always sharp pencils using this Office electric pencil sharpener. Keep your pencils sharp and ready with a powerful motor that operates stall under normal use. Auto Start/Stop: Equipped with auto-start/stop mechanism and a safety switch that cuts power when shaving tray is removed. This powerful sharpener is compatible with all pencil types between 6 - 8 mm. Easy to Clean: Featuring with large and well sealed translucent shavings tray, you can observe the capacity of pencil crumbs conveniently reveals when tray is full. Multiple Power Sources: Powered by excluding 4 AA batteries or AC adapter. Flexible and convenient to use anywhere and easy to carry around. Compact Design: Office compact pencil sharpener is ideal for tight office spaces since it takes up minimal room on your desktop.