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And neither phones or similar, as they are not at all super low-power.

I wonder if it might work with thinks like air buds. Or if the constant energy required to make the sound for hours not stop is to high?

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100 uW is nowhere near enough for wireless headphones. They use about 70 milliwats of power, with a 1.5Wh battery lasting 24 hours. So you'd need three orders of magnitude more power.

Maybe a phone on standby - just listening for calls or something.

A phone would still need a regular battery for normal operation. At that point you can just use for everything

Good point, perhaps tiny IoT devices.

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