Old computer keyboard:
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Shutting, fan noise, Turning on the computer
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Floppy disk reading
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Laser printer
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Bios, Sound signal of a bios computer
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Communication room, computer noise
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Manual copy machine
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Signal read information, Computer interface
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Computer mouse click
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CD / DVD drive, disc read
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Computer mouse movement
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Double click computer mouse
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The USB flash drive is inserted, removed
★★★★★