Ohuhu Electric Automatic Pencil Sharpener, Special Design for Colored Pencils [Special Design for Colored Pencils] Sharp durable SK5 steel blade & large easy-clean shavings tray with faster and stable cutting performance. 100% Kid Safe!- Automatic safety lock function function: The pencil sharpener stops operation once the shaving tray is removed. Never Over-sharpening! - Automatic idling once the pencil tip has been shaved within 0.3-0.5mm/0.01"-0.02". Now you will never worry a pointy tip to destroy your work. Replaceable Sharpener Core Design - greatly extending the service life. [1 * replacement core included] Multiple Power Sources - Can be powered by either USB (wire included) or 4 AA batteries (not included).