Computer keyboard:
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Laser printer
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Room noise, read, Hard disk, write
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Computer interface, alarm
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Removed, The USB flash drive is inserted
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Disc read, CD / DVD drive
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Opens, closes the CD / DVD tray
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Photocopy (photocopy)
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Computer interface, signal read information
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Modem connection, interference, signal
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Matrix printer
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Computer mouse click
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Fan noise, Turning on the laptop, shutting
★★★★★