Xgeek174; [2-Pack]-Power Charger Converter Connector Adapter Cable Cord for ThinkPad X1 Carbon 0B47046 UltraBook PC-Size 7.9x5.5MM [1]-Connector A: 7.9 X 5.5 MM (Female) Connector B: Slim Tip (Male) Compatible With: Lenovo ThinkPad T440, T440p [2]-Connector B: Slim Tip (Male) [3]-Length: 7" (7 Inch) [4]-Connect this adapter between old type round jack to latest laptop with square DC input port [5]-Replace and Compatible with Lenovo ThinkPad X1 Carbon 0B47046 Laptop