When Elina tested it the next morning, the readings made no sense. At 2,000 Hz—the frequency of human speech—SONE214 didn’t just absorb sound. It converted 94% of the incident acoustic energy into a minuscule electric current, less than a nanowatts, but measurable. And it did so without backscatter or heat buildup.

Because of its extreme performance metrics, the is not for Arduino hobbyists (unless they are building reference equipment). It is designed for mission-critical analog domains.

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