Opens, closes the CD / DVD tray, disc read:
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The USB flash drive is inserted, removed
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Computer simulated laser
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Franking machine
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Repeatedly pressing a computer mouse
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General noise, Office work
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Signal, Modem connection, interference
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Opens, disc read, closes the CD / DVD tray
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Photocopy (photocopy)
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Floppy disk reading
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Computer mouse click
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Turn off the hard drive, Turn on
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Matrix printer
★★★★★