A vacuum cleaner:
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Humming fan, off, Computer turning on
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Cool sound for notification
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Vibration noise, Faulty air conditioning
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Air conditioning (outdoor unit)
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Email message sound
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Spaceship freezer, defrost process
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Windows notification sound
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Android notification sound
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Sound to start presentation
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Clothes dryer
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Hissing old tv
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Whatsapp notification sound
★★★★★