Hard disk, read, write, room noise:
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Modem connection, signal, interference
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Closes the CD / DVD tray, disc read, Opens
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Closes the CD / DVD tray, Opens
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Photocopy (photocopy)
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Computer mouse click
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Office work, general noise
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Computer keyboard
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Franking machine
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Jet printer
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Shutting, Turning on the laptop, fan noise
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Laser printer
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Computer simulated laser
★★★★★