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Product description: Specifications: Material: Plastic Color: Black Install battery: 1.According to the arrows on the lid Push the battery cover. 2.Install 2 AAA batteries according to the positive and negative marks. 3.Cover the battery lid. Operation: 1.Press the button and the eraser starts to rotate. 2.Rotate back and forth to erase all the place you don't need. Replace the eraser: 1.After the rubber is used up, pull out the rubber clip. 2.Then pull out the eraser about 3mm. 3.Back to the original, you can re-use. Note: 1.Powered by 2 AAA batteries(not included). 2.Please do not place any part of this product in the mouth. 3.Long-term non-use, remove the battery. Package including: 2x Electric eraser 24 x Big Eraser Refills 20 x Small Eraser Refills