Connecter AC Charger Power Supply Adapter Converter Cable For Lenovo ThinkPad T440 T440S
convert round connector to square connector.
You can connect this adapter between round connection to latest laptop with square DC input port.
7.9 x 5.5mm female round jack
Rectangular connector has center pin This is the new tip with built-in chipset for new generation of the IBM, Lenovo & Thinkpad laptop
Make sure that the voltage and current rating for the AC adapter match the original charger