You could quote the source where you got this content from.
https://www.washington.edu/news/2017/07/05/first-battery-free-cell-phone-makes-calls-by-harvesting-ambient-power/
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You could quote the source where you got this content from.
https://www.washington.edu/news/2017/07/05/first-battery-free-cell-phone-makes-calls-by-harvesting-ambient-power/
All text in my post is my own and the media comes from the University in question.