There are numerous situations in which a robot doesn’t need to move quickly, but it does need to cover long distances without having to recharge its batteries. The minuscule energy-harvesting MilliMobile robot was designed for just such scenarios.

Created by a team of scientists at the University of Washington, the four-wheeled prototype device measures just 10 mm (0.4 in) per side, and tips the scales at about 1 gram (0.04 oz).

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It contains no batteries, but does incorporate two motors, a carbon fiber chassis, a foldable printed circuit board, a light sensor, solar cells and an antenna. What’s more, it can carry up to three times its own weight in the form of cargo such as cameras and environmental sensors.

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