Although multiple users claim that there are these types of scanners in Japan, we only have evidence of their existence through several university students in Seoul, South Korea. Students at Kyung Hee University describe this device as leaves no dust when erasing, but in many cases it is faster to erase directly by hand.
It is a device that has more than 10 years old; which explains its retro design and the fact that in this case it does not store the saved writing, it just deletes it. The idea of scanners capable of saving what they erase in order to copy the notes later is not new and there are several more modern designs that go in this direction.
This blackboard with an electronic eraser has gone viral these days, probably because of that combination of extravagant aesthetics, original idea and enormous potential to change the way we might have attended in class.
According to then24.com