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 today.
But the world's cheapest computer, costing just $25, has astonished its British creators by selling 1.5million units in 18 months.
The Raspberry Pi is now powering robots in Japan and warehouse doors in Malawi, photographing astral bodies from the US and helping to dodge censorship in China.
"We're closing in on 1.5million [sales] for something that we thought would sell a 1000," said Eben Upton, executive director of the Raspberry Pi Foundation.
"It was just going be a little thing to solve a little problem."
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