Pressing a keypad, input error sound:
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Alarm, Computer interface
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The USB flash drive is inserted, removed
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Turn on, turn off the old monitor
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Insert the disk into the drive, read the
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Manual copy machine
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Sound signal of a bios computer, bios
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Computer mouse click
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Old computer keyboard
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General noise, Office work
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Write, Hard disk, room noise, read
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Fan noise, Turning on the laptop, shutting
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Turn on, turn off the old computer
★★★★★