Pressing a keypad, input error sound:
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Matrix printer
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Office work, general noise
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Write, read, room noise, Hard disk
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Interference, Modem connection, signal
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Computer interface, signals
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Alarm, Computer interface
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Signal read information, Computer interface
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Old computer keyboard
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Turn on, turn off the old monitor
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Opening, closing the laptop cover
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Turn off the old computer, Turn on
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Closes the CD / DVD tray, Opens
★★★★★