This Body Heat-Powered Smartwatch Gets One Thing Very Right
Gizmodo -

One of the most interesting gadgets I've tested in the past few years was the Matrix PowerWatch. a fitness-tracking timepiece powered only by the wearer's body heat. The battery-free technology was neat, but the watch's limited functionality wasn't. Matrix Industries' new PowerWatch X promises to be a more useful and capable wearable, but even with infinite battery life, it still falls short of being a useful smartwatch.

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