HAHOME Electric Pencil Sharpener with 2 Different Sizes of Holes, Both Electronic and Battery Operated (JD3006-2) Special Two Holes Style:Featuring two separate holes for different pencil diameters:6-8 mm and 9-12mm;Convenient for teachers ,parents,students that loves to sketch and draw a lot Safety Design:There is a protection lock on the unit for jumbo pencils. Prevent the kids to insert their fingers into the hole;To unlock, insert the pencil then press the green button on top of the sharpener Sharpening:Premium carbon steel blades,much quicker than the helical knife.It takes approximately 8 seconds to sharpen a new pencil Automatic Operating :To sharpen, all you have to do is insert the pencil and it will be sharpened automatically;The shavings compartment is easy to open and remove Multiple Power Sources :Power for this sharpener is supplied by either 4 AA batteries (Not included)or an AC electric plug