Modem connection, signal, interference:
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Closes the CD / DVD tray, Opens
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Manual copy machine
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Matrix printer
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Signal, interference, Modem connection
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Alarm, Computer interface
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Jet printer
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Computer interface, signal read information
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Computer mouse click
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CD / DVD drive, disc read
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Turn off the old monitor, Turn on
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Double click computer mouse
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Computer keyboard
★★★★★