It is a special power converter cable for IBM Lenovo ThinkPad Edge Laptop Notebook PC such as X1 Carbon Yoga 13 or other future laptops which DC input port is square.
One side is 7.9 x 5.5mm female plug, another side is Square male plug for X1 Carbon Ultrabook.
You can connect this adapter between old type round jack to latest laptop with square DC input port
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