Herbert is an electrically operated sharpener for all pencils. Sharpening school pencils, artist pencils, graphite and coloured pencils is a breeze! Simply charge the battery with the included MICRO USB cable. The sharpener is suitable for all pencil shapes between 6 and 12 mm in diameter. Whether round, with three or six edges, or for pencils without a wooden sheath Herbert sharpens everything with flying colours!With rechargeable batteryAutomatic stop at perfect tipFor graphite and colored pencils 6-12 mmFast, easy sharpening in 3-10 seconds