Pressing a keypad, input error sound:
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Photocopy (photocopy)
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Laser printer
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Double click computer mouse
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General noise, Office work
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Signal, interference, Modem connection
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Typewriter, Office work, environmental sounds
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Fan noise, shutting, Turning on the computer
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Turn off the old monitor, Turn on
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Signal read information, Computer interface
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Turn off the hard drive, Turn on
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Floppy disk reading
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Old computer keyboard
★★★★★