Communication room, computer noise:
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Alarm, Computer interface
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Laser printer
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Matrix printer
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Turn on, turn off the old computer
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Turn on, turn off the hard drive
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Office work, general noise
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Signal, interference, Modem connection
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Pressing a keypad, input error sound
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Manual copy machine
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Signal read information, Computer interface
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Opening, closing the laptop cover
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Write, Hard disk, read, room noise
★★★★★