erase your entire image press a button.
sealed 3v watch battery can be replaced, battery life: one hundred thousand times.
with a sleeve case,which protect your blackboard and prevent pressing the erase button.
there is a small hole in the upper left corner, can hang on to the wall or refrigerator, leave message to your family.
record work, painting, children practicing words, arithmetic, message board, saving paper, to avoid pollution caused by the pen.
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