Double hole design fits for different pencil diameters: 6-8mm, 9-12mm Durable mechanism with 2 high quality carbon steel sharpening blades Replaceable blade make it easy to clean up and having a longer life Powered by 4 AA batteries(not included) or through USB cord. The power sources can be a computer, power bank or phone charger. Safe, stop working when the shaving waste receptacle is removed Eagle double-hole electric pencil sharpener fits for different pencil diameters, 6-8 mm and 9-12 mm. Replaceable blades make it easy to clean up and have a longer life. Small in size, it is portable and can be put in a drawer. Its safety stop feature keeps you from using it when the shaving waste receptacle is removed. Can be powered by 4 AA batteries(not included) or through a USB cord. The power sources can be a computer, power bank or phone charger.