Pressing a keypad, input error sound:
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Photocopy (photocopy)
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Alarm, Computer interface
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Computer keyboard
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Old computer keyboard
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Turn on, turn off the hard drive
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Disc read, Opens, closes the CD / DVD tray
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Signal read information, Computer interface
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Laser printer
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Bios, Sound signal of a bios computer
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Double click computer mouse
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Signals, Computer interface
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Signal, Modem connection, interference
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