9
Matrix adds a solar cell to its battery-free smartwatch
The company claims it can do GPS and optical heart-rate tracking without a battery.
Matrixindustries
8Matrix PowerWatch hands-on: The promise of a world without chargers
Your body is this smartwatch’s power source.
9The PowerWatch is a body heat-powered smartwatch that does very little
At least you don’t have to worry about charging, though.
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