Turn on, turn off the old monitor:
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Alarm, Computer interface
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Jet printer
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Input error sound, Pressing a keypad
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Laser printer
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Floppy disk reading
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Repeatedly pressing a computer mouse
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Office work, typewriter, environmental sounds
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Modem connection, signal, interference
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Computer keyboard
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Photocopy (photocopy)
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Manual copy machine
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The USB flash drive is inserted, removed
★★★★★