Opens, closes the CD / DVD tray:
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The USB flash drive is inserted, removed
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Signal, Modem connection, interference
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Computer keyboard
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Double click computer mouse
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Read, Hard disk, write, room noise
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Repeatedly pressing a computer mouse
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Opens, disc read, closes the CD / DVD tray
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Laser printer
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Turn on, turn off the hard drive
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Opening, closing the laptop cover
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Communication room, computer noise
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Manual copy machine
★★★★★