Modem connection, signal, interference:
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Computer mouse movement
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Office work, general noise
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Turn off the old monitor, Turn on
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Jet printer
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Computer interface, alarm
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Floppy disk reading
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CD / DVD drive, disc read
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Laser printer
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Photocopy (photocopy)
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Manual copy machine
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Removed, The USB flash drive is inserted
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Bios, Sound signal of a bios computer
★★★★★