Modem connection, signal, interference:
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Manual copy machine
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Opening, closing the laptop cover
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Turn on, turn off the old computer
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Computer interface, signal read information
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Old computer keyboard
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Closes the CD / DVD tray, Opens, disc read
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Removed, The USB flash drive is inserted
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Turn off the old monitor, Turn on
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Office work, general noise
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Bios, Sound signal of a bios computer
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Photocopy (photocopy)
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Disc read, CD / DVD drive
★★★★★