Old tv on, off:
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An electric toothbrush
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Computer turning on, humming fan, off
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Sewing machine
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Windows notification sound
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Whatsapp notification sound
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Electronic melody for SMS alerts
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IPhone notification sound
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Android notification sound
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Spaceship freezer, defrost process
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Cool sound for notification
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On, Air conditioning, off
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Air cut, Fan blade rotation
★★★★★