Electric Pencil Sharpener,Upeffeet Convent Automatic Pencil Sharpener Coal Colored Pencils for Drawing Batteries Powered For Classroom Office Art Studio Outdoor Painting Sketching (Bi-power Source) Special Two Holes Style - Featuring two separate holes for different pencil diameters:6-8 mm and 9-12 mm;Committed to work better for standard or coloured pencils;Convenient for teachers ,students that loves to sketch and draw a lot. Safety Mechanism - A protection lock on the unit (9-12 mm) for jumbo pencils, prevents the kids to insert their fingers into the hole;To unlock, insert the pencil then press the green button on top of the sharpener Efficient Sharpen & Perfect Point - Premium carbon steel blades,much quicker than the helical knife.It takes approximately 8s to sharpen a new pencil. Whether you prefer a Sharp, Medium, or Blunt tip, this hi-tech pencil sharpener quickly and automatically sharpens pencils to perfection every time Multiple Power Sources - Power for this sharpener is supplied by either 4 AA batteries (Not included)or a Charging adapter.Power adapter is included for indoor use and it is also powered by AA batteries for taking it anywhere. Easy To Clean - Once the shaving tray is removed, the unit will stop operating. To clean, just slide the tray out to empty pencil shavings. Recommended for personal outdoor sketching ,school ,home study,office use.