A Wear OS smartwatch running an FFT-based decoder can receive covert 18-22 kHz B-FSK transmissions from nearby computers at short range, but the paper's reported SNR/BER tables contain internal inconsistencies and omit the watch model and sampling rate.
On acoustic covert channels between air- gapped systems,
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SmartAttack: Air-Gap Attack via Smartwatches
A Wear OS smartwatch running an FFT-based decoder can receive covert 18-22 kHz B-FSK transmissions from nearby computers at short range, but the paper's reported SNR/BER tables contain internal inconsistencies and omit the watch model and sampling rate.