It's a single circuit board the size of a credit card with no screen or keyboard, a far cry from the smooth tablets that dominate the technology market.
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But the world's cheapest computer, costing just $25 (£17, 19.50 euros), has astonished its British creators by selling almost 1.5 million units in 18 months.
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The Raspberry Pi is now powering robots in Japan and warehouse doors in Malawi, photographing astral bodies from the United States and helping to dodge censorship in China.
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"We're closing in on one and half million (sales) for something that we thought would sell a thousand," said Eben Upton, executive director of the Raspberry Pi Foundation.
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"It was just supposed to be a little thing to solve a little problem.
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"We've sold many more to children than we expected to sell, but even more to adults. They're using it like Lego to connect things up."
Computers are very important at this present age we're on so they come in different prices right now. There are so many cheap ones....