Opens, closes the CD / DVD tray:
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Environmental sounds, Office work, typewriter
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Double click computer mouse
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Repeatedly pressing a computer mouse
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Bios, Sound signal of a bios computer
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Turn on, turn off the old monitor
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Write, read, room noise, Hard disk
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Floppy disk reading
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Laser printer
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Turning on the laptop, shutting, fan noise
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Alarm, Computer interface
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Franking machine
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The USB flash drive is inserted, removed
★★★★★