Turning on the laptop, fan noise, shutting down:
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Computer keyboard
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Manual copy machine
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Bios, Sound signal of a bios computer
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Input error sound, Pressing a keypad
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Jet printer
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Floppy disk reading
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Modem connection, interference, signal
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Computer mouse click
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Shutting, Turning on the computer, fan noise
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Turn on, turn off the old monitor
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Double click computer mouse
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Communication room, computer noise
★★★★★