ProAid Electric Eraser, Electric Eraser Kit with 20 Eraser Refills, for Carbon and Colored Pencil, Students and Artist Tools, Surgically Erasing (Blue) Erasing Cleanly,Fast and Precisely: ProAid electric eraser erase drawing and sketch fast and cleanly without smudging, precisely even for very tiny pencil lines or marks. Great for Students and Artists: If you have students or sketchers in your families, this eraser would be greatly helpful for them to remove the mistakes or extra drawing. Great for free hand drafting. Applicable for both Charcoal and Colored Pencil: Both charcoal and colored pencil sketches are workable. But crayon marks are not applicable. Compact and Lightweight Design: This eraser is battery operated and cordless. Very light weight and convenient for operatic. The user only need load 2 AAA batteries and press the switch button lightly. The eraser starts to work Reliable and Friendly Customer Service: ProAid ready to respond within 24 hour time frame.30-day money back guarantee, 12 months replacement warranty and lifetime support guarantee.