Кабел преходник Lenovo 7.9mm round jack to Lenovo Square LENO-26

It is 7.9mm Round Jack (old type) to Square Plug End (new type) Adapter. 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. You need make sure the AC adapter voltage and current to be same as your original one.

Connector: 7.9mm to 5.5mm (round to square)
Male: Square with Pin

You can connect this adapter between old type round jack to latest laptop with square DC input port.