Insten Power Adapter Cable Compatible for IBM ThinkPad X1 0B47046 Carbon Ultrabook Notebook PC, Black Special power converter cable for IBM Lenovo ThinkPad. Color: Black. Connector A: 7.9 X 5.5 mm (Female).Connector B: Slim Tip (Male).Length: 13.5 cm. You can connect this adapter between old type round jack to latest laptop with square DC input port. Ideal replacement power charger adapter