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Future wearable devices could draw power through your body using background 6G cellphone signals

Live Science
Summary
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Researchers from the University of Massachusetts Amherst found that waste radio frequency (RF) energy given off by visible light communication ( VLC ) can be harvested with small, inexpensive copper coils.

The researchers created "Bracelet+" — a simple copper wire coil that could be worn as a bracket on the upper forearm.

The energy harvesting technology could, therefore, become a form of in-situ charger for next-generation wearable devices.