Opens, closes the CD / DVD tray:
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Photocopy (photocopy)
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Fan noise, shutting, Turning on the laptop
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Repeatedly pressing a computer mouse
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Input error sound, Pressing a keypad
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Computer mouse click
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Computer simulated laser
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Franking machine
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Jet printer
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Opens, disc read, closes the CD / DVD tray
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Room noise, write, Hard disk, read
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General noise, Office work
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Matrix printer
★★★★★