Computer turning on, off, humming fan:
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An electric toothbrush
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Hissing old tv
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Cool sound for notification
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Air cut, Fan blade rotation
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A vacuum cleaner
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Electronic melody for SMS alerts
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Android notification sound
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Computer turning on, humming fan, off
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Spin, read, Hard disk
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Popcorn machine
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Faulty air conditioning, vibration noise
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Air conditioning (outdoor unit)
★★★★★