Colourful nano-drones, described by designers as the world's smallest flying drone, proved to be a big crowd puller at the International Tokyo Toy Show.
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The smallest drone was 3.5 cm wide and weighed 9 grams, although a heavier 11 gram version was equipped with a camera able to film four minutes of video. The green, pink and blue remote controlled nano-drones cost between $60 and $100 and were light enough that they do not require a permit to fly in Japan.
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