Opening, closing the laptop cover:
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Opens, closes the CD / DVD tray
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Room noise, Hard disk, read, write
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Manual copy machine
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Photocopy (photocopy)
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Signal, Modem connection, interference
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Jet printer
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The USB flash drive is inserted, removed
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Computer keyboard
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Double click computer mouse
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Computer simulated laser
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Office work, general noise
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Franking machine
★★★★★