Modem connection, signal, interference:
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Photocopy (photocopy)
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Shutting, fan noise, Turning on the laptop
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Floppy disk reading
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Jet printer
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Room noise, read, write, Hard disk
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Communication room, computer noise
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Sound signal of a bios computer, bios
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Shutting, Turning on the computer, fan noise
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Computer interface, alarm
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Turn on, turn off the old computer
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Double click computer mouse
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Franking machine
★★★★★