LENOVO AC-Adapter 135 Watt 20V 6.75A Slim-Tip 3Pin

The Lenovo 45N0554 AC adapter powers compatible Lenovo laptops from a wall outlet. Rated at 135 W with a 20 VDC output, it converts alternating current to the direct current the laptop needs while connected to mains power.

The listed compatible models are ThinkPad E560p, S5 2nd Gen, T440, T440p, T440s, T460p, T470p, T540p, W540 and W541. The product page also gives machine type codes, including 20G5 for E560p, 20JA for S5 2nd Gen, and 20B6 and 20B7 for T440. Check the model and machine type against your laptop when choosing a replacement.

It is intended for powering the specific ThinkPad families listed, whether you are using the laptop normally or need to run it from the mains without relying on its battery.