Turn on, turn off the old computer:
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Computer interface, signals
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Laser printer
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Alarm, Computer interface
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General noise, Office work
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Computer mouse click
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Photocopy (photocopy)
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Jet printer
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Computer keyboard
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Signal, Modem connection, interference
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Removed, The USB flash drive is inserted
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Computer interface, signal read information
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Double click computer mouse
★★★★★