Computer turning on, off, humming fan:
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Electric razor
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Whatsapp notification sound
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Fan blade rotation, air cut
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Sound to start presentation
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An electric toothbrush
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Air conditioning, off, on
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Electric wheelchair
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Sewing machine
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Android notification sound
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Humming fan, off, Computer turning on
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Air conditioning (outdoor unit)
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Electronic melody for SMS alerts
★★★★★