This is an AC adapter for an IBM laptop. The laptop itself broke down and was discarded a long time ago, but I still have this, so would anyone who needs it be interested? I checked before listing to make sure the voltage was correct, and it was outputting a proper 16V. - Brand: IBM - AC Adapter Type: For laptop - Output Voltage: 16V - Output Current: 4.5A - Input Voltage: 100-240V - Plug Shape: Circular - Model Number: AA21131 Thank you for looking.