This is a genuine OEM Lenovo 135W yellow square tip AC adapter charger, model ADL135NLC2A 45N0556. It is compatible with Lenovo ThinkPad laptops and is designed to provide a reliable and efficient charging experience. The adapter has a voltage of 20V and a current output of 6.75A, making it a powerful and effective component for your laptop.

In addition, this adapter is designed with a yellow square tip to prevent it from sliding around while charging. It is a great replacement for your old or damaged adapter, ensuring that you can continue using your Lenovo ThinkPad laptop without any interruptions.