Modem connection, signal, interference:
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Turn off the hard drive, Turn on
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Jet printer
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Environmental sounds, Office work, typewriter
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Computer keyboard
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Input error sound, Pressing a keypad
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Computer simulated laser
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Photocopy (photocopy)
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Laser printer
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General noise, Office work
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Opening, closing the laptop cover
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The USB flash drive is inserted, removed
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Communication room, computer noise
★★★★★