Portable fan:
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Hard disk, spin, read
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An electric toothbrush
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Exhaust fan
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Whatsapp notification sound
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A vacuum cleaner
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Air conditioning (outdoor unit)
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IPhone notification sound
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Faulty air conditioning, vibration noise
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Fan blade rotation, air cut
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Cool sound for notification
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Electronic melody for SMS alerts
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Off, on, Air conditioning
★★★★★