Value meal come with drink and french fries.

oh, it is battery operated AAA size ones. And then, there is a button, you press it and it will vibrates. Very clean.
By the way, the other electric eraser in market here is RARE and FEW. and the derwent and artist brands all exceed $50. Only the smart ass Japanese ones is cheaper than $50. and Even so, most of them is more than $15.