In its current state, the Pebble prototype is powered by a circuit board that's much larger than the watch itself.

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Six prototype plants are on the drawing board.

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His early prototype takes a few cues from Boogie Board's line of scratch pads.

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Synaptics' prototype pad had a grid of electrodes running across a board.

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Fujitsu intelligent phone prototype This speedy quad-core smartphone prototype has a 13.1-megapixel camera on board and is waterproof like its Japanese compatriot the Panasonic Eluga.

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The PCB is attached to the watch with a maze of wires, and allows the team to prototype new software and debug the system before commissioning the final miniature board that will go inside the shipping product.

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What began as a prototype built around a tower of Arduino shields is now a small first-run integrated board with spots for connecting XBee radio cards and a small LCD display.

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