Computer interface, signals:
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Franking machine
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Removed, The USB flash drive is inserted
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Repeatedly pressing a computer mouse
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Old computer keyboard
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Input error sound, Pressing a keypad
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Computer mouse click
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Manual copy machine
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Double click computer mouse
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Computer interface, signals
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Turn on, turn off the old monitor
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Modem connection, interference, signal
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Computer simulated laser
★★★★★