An electric toothbrush:
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Air conditioning, on, off
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Spaceship freezer, defrost process
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Popcorn machine
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Sound to start presentation
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Electric wheelchair
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A vacuum cleaner
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Humming fan, off, Computer turning on
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IPhone notification sound
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Portable fan
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Electronic melody for SMS alerts
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Fan blade rotation, air cut
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Cool sound for notification
★★★★★