Pressing a keypad, input error sound:
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Computer keyboard
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Jet printer
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Computer simulated laser
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Disc read, CD / DVD drive
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Matrix printer
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Old computer keyboard
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Interference, signal, Modem connection
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Opens, closes the CD / DVD tray
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Repeatedly pressing a computer mouse
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General noise, Office work
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Room noise, write, Hard disk, read
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Removed, The USB flash drive is inserted
★★★★★