Opens, closes the CD / DVD tray, disc read:
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The USB flash drive is inserted, removed
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Computer keyboard
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Opens, closes the CD / DVD tray
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Shutting, fan noise, Turning on the laptop
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Matrix printer
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Turn on, turn off the old computer
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Computer mouse movement
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Jet printer
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Computer noise, Communication room
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Pressing a keypad, input error sound
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Turn off the old monitor, Turn on
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Computer interface, signal read information
★★★★★