Electric Sharpener Cobee Battery and USB Power Sharpener with 1 Free Sharper (white) Safe Lock Function: The pencil sharpener stops operation once the shaving tray is removed. 100% kids safe. Replaceable Design - greatly extending the service life. (coming with 1 replacement core included) Automatic idling once the pencil tip has been shaved within 0.3-0.5mm/0.01"-0.02". Never over sharping. Multiple Power Sources: USB wire (included) or 4 AA batteries (not included), portable and convenient. Nice Gift for friends, students and artist. Also a great for Thanksgiving, Christmas.