Eono by Amazon - Electric Eraser Kit, Battery Operated Automatic Portable Rubber Pencil Eraser, with 22pcs Additional Replaceable Rubber Refills (Diameter 2.3mm 10pcs and 5mm 12pcs), Black

Install battery:
1.According to the arrows on the lid Push the battery cover.
2.Install two NO.7 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...