Computer interface, signals:
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Jet printer
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Shutting, fan noise, Turning on the laptop
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Manual copy machine
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Read, Hard disk, write, room noise
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Computer keyboard
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Opening, closing the laptop cover
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Computer mouse movement
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Old computer keyboard
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Computer interface, signals
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Closes the CD / DVD tray, disc read, Opens
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Computer interface, signal read information
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Turn off the old computer, Turn on
★★★★★