![Future wearables could use body heat for power](https://static.techspot.com/images2/news/ts3_thumbs/2020/05/2020-05-29-ts3_thumbs-e94.jpg)
Their prototype TEG measures 4.5 inches long by 1.1 inches wide. When wrapped around the wrist of a test subject, the device was able to leverage the difference in temperature between the wearer’s skin and the ambient environment to power an LED.
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