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Powered by 2 AAA batteries (not included).
22 PCS rubber refills,easy to dismantle and replace.
Controlling it with a small button, rotate back and forth to erase.
A good helper of painter,student,designer.
Tihoo Electric Eraser Kit Automatic Pencil Eraser with 22pcs Additional Replaceable Rubbers (Diameter 2.3mm 10 pcs and 5mm 12 pcs) (Light gray) - B075Q66LFZ