This Derwent Battery Operated Eraser is a very handy tool for all artists. It erases quickly and offers you accurate and precise control. Complete with on and off control button which is positioned so it is held like a pen, this handy battery-operated eraser is perfect for left-and right-handed use. Also included in the pack are eight long replacement erasers, enabling you to refill your eraser device whenever you need to.This handy tool requires two AAA batteries (not included). Size: 20.3 x 7.9 cm (8 x 3.1 inches)Includes eight replacement erasersRequires two AAA batteries (not included)Erase with complete controlDerwent Battery Operated Eraser