Adjustable: The length of the eraser can be adjusted. Pull out the rubber head to set the desired length and insert it to use. Replaceable Tip: Thick and thin eraser tips can be swapped, with two diameters available: 5mm and 2.3mm. Battery Powered: Requires 2 AAA batteries. Open the back cover, insert 2 AAA batteries, and it's ready to use, offering convenient battery operation. Pen Shape: This pen eraser features a pen-like shape, making it easy to hold and use. It feels like holding a regular pen. Soft Texture: The detail eraser comes with 10 small refills and 12 large refills. The rubber head has a soft texture, and the electric eraser provides a very clean erase. Item Type: Electric Eraser Kit Material: Plastic, Alloy Product Features: Sketch Highlight Electric Eraser with Adjustable Thickness, Easy to Draw Highlight Effect. Battery Type: AAA Battery (Battery Not Included) Number of Batteries: 2 Package Contents: 1 x Electric Eraser 2 x Plastic Rubber Sleeves 10 x 2.3mm Erasers 10 x 5mm Erasers