Item description for 5.5mm Round Tip to Square Tip for IBM Lenovo Thinkpad Laptop Notebook Adapter

Converts round power adapter connector with 2.1 mm Inside diameter and 5.5 mm outside diameter to standard rectangle Lenovo charger connector.

Works with the following models:

• IdeaPad Yoga 11

• ThinkPad Yoga S1

• ThinkPad Helix

• ThinkPad T431s

• ThinkPad X230s, X240, X240s

• ThinkPad T440s (with Intel graphics)

• IdeaPad Yoga 13

• ThinkPad Edge E531

• ThinkPad Edge E540

• ThinkPad T440s (with descrete graphics)

• ThinkPad X1 Carbon

• ThinkPad T540p

• ThinkPad W540p

• ThinkPad W540 (i5+K1100M)