The tiny chopper, made by Seiko Epson, weighs only 10 grammes and is seven centimetres tall, and could be used as a flying camera in disasters.
Although it is remote controlled, it has to get its power from a cable. Seiko Epsom hope to get another company to make a super-lightweight battery.
It has taken the company three years to develop the mini-copter.
The International Robot Exhibition is always popular.
This year organisers are expecting about 100,000 people to go to the four-day event.
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