So they're using low to medium energy microwaves to power devices? Well if anyone doesn't buy that they can always try and sell it as a heater [1]. [1] [this video]
Indeed [this video] Microwave frequencies used in ovens would be dangerous because they can penetrate deep in the body and heat internal tissues, but in the EHF range microwave heating could be safe. See for instance [link] With all that said, what I had in mind is in the far less scary and far more prosaic near-infrared range.
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