Office work, general noise:
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Input error sound, Pressing a keypad
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Signal read information, Computer interface
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Repeatedly pressing a computer mouse
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Computer mouse movement
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Computer interface, signals
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Modem connection, signal, interference
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Disc read, CD / DVD drive
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Removed, The USB flash drive is inserted
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Old computer keyboard
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Photocopy (photocopy)
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Computer simulated laser
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Laser printer
★★★★★