Opens, closes the CD / DVD tray, disc read:
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Shutting, Turning on the laptop, fan noise
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Turn off the old computer, Turn on
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Laser printer
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General noise, Office work
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Interference, signal, Modem connection
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Turn off the old monitor, Turn on
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Manual copy machine
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Computer keyboard
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Franking machine
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Old computer keyboard
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Repeatedly pressing a computer mouse
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Floppy disk reading
★★★★★