Feature:1. Features: Erasing clean, does not hurt the paper, labor saving and efficient, USB charging, adjustable thickness, pen grip, light and portable, low bass.2. Rechargeable: Built in lithium ion battery, this electric eraser can be used many times after being charged. Stop wasting money on batteries. Unlock an economical and environmentally friendly erasing experience!3. Ergonomic Switch Design: Instead of a big rectangle, this automatic eraser is ergonomically designed to be more comfortable to hold. The comfortable big switch is very responsive. Marks can be removed with the push of a button.4. Powerful Erase Capability: The circular motion and powerful motor allow you to erase the target area efficiently and accurately. With just a little pressure, you have tremendous power.5. Package Includes: To meet your long term use of electric erasers, the electric eraser kit comes with 8 thin eraser refills, 8 thick eraser refills, 1 USB cable, and 2 rubber jackets.Specification:Item Type: Electric EraserProduct Material: PlasticBattery Type: Lithium Battery (Built in Battery Delivery)Battery Capacity: 600mAhNumber Of Batteries: OneBattery Model: 18650.Package List:8 x Eraser Refill Thin Head8 x Eraser Refill Thick Head2 x Thin Rubber Jacket1 x Charging Cable1 x Electric Eraser