Feature:1. Low Noise: The electric pencil eraser has a noise reduction design, low noise will not disturb your study2. Large Capacity Charging: The electric eraser is a large capacity charging model, charging for 3 hours, usable for 30 days, 20 times a day, 9 seconds each time, usable for 30 days3. 2 Refills: The rechargeable electric erasers have two kinds of refills, thick core eraser for daily study and fine core eraser for painting4. Plastic Collet: The electric drawing eraser comes with a low temperature plastic collet, which is not hot enough to handle5. Non Slip Design: The electric eraser has a red button non slip design, suitable for small children to grasp, press, and wipe back and forth with a light pressSpecification:Item Type: Electric EraserMaterial: ABS, TPRFunction: Sketching, Painting, Industrial DesignBattery Type: Lithium Battery(shipped with built in battery)Battery Model: 14500Battery Capacity: 800mAhCoarse Core Rubber: Daily LearningThin Core Eraser: for Painting, for Highlighting, for DetailingCharging: Red Light when Charging, Green Light when Fully Charged, Blue Light when WorkingProduct Size: Approx. 2.7 x 16cm / 1.1 x 6.3in.Package List:1 x Electric Eraser1 x USB Cable1 x Sticker1 x Rubber Sleeve Clip16 x Thin Erasers (with 6pcs in the Product)12 x Thick Erasers (with 2pcs in the Product)Note:Shipped with Built in Battery