Raniaco Electric Pencil Sharpener with 2 Different Sizes of Holes, Both Electronic and Battery Operated Premium carbon steel blades and sharpener size: 4.4 x 2.8 x 3.1 (in) Two separate holes for different pencil size and detachable collect scrap box A pair of replacement blades and a mini screwdriver included. Please insert the pencil into the hole slightly.It takes approximately 8 seconds to sharpen a new pencil into tip thanks to the sharp blade. It will sharpen pencils much quicker than the helical knife. We recommand that please check the pencil every 2 or 3 seconds when sharpen the pencils. Powered by 4 pieces of size AA batteries for mobile use; Power adapter is also included for stationary use