Genuine ASUS AC Power Adapter PA-1650-02, in excellent exterior condition.  Label on bottom shows "Input: 100-240V 1.6A 50-60Hz / Output: 19V 4.74A".  Connector appears to be male with 2.5mm inside diameter and 5mm outside (the yellow ring -- see picture).  Please note that we have not connected this to a device to check its operation.

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