SMS notification sound:
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Humming fan, Computer turning on, off
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Air conditioning (outdoor unit)
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Email message sound
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On, off, Air conditioning
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Fan blade rotation, air cut
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Clothes dryer
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Read, spin, Hard disk
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An electric toothbrush
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Faulty air conditioning, vibration noise
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Exhaust fan
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Spaceship freezer, defrost process
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Sewing machine
★★★★★