Hard disk, spin, read:
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Windows notification sound
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Popcorn machine
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Humming fan, Computer turning on, off
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An electric toothbrush
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Email message sound
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A vacuum cleaner
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Defrost process, Spaceship freezer
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Whatsapp notification sound
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Electronic melody for SMS alerts
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Air conditioning (outdoor unit)
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Air cut, Fan blade rotation
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Cool sound for notification
★★★★★