The Slim 170W Charger AC Power Adapter for Lenovo ThinkPad with a Rectangle Tip is a high-quality power supply specifically designed for Lenovo laptops. With a voltage of 20V and an output current of 8.5A, it is compatible with various Lenovo ThinkPad models. The black color and compact design make it easy to transport and use on the go. Even with this charger being used, light use over the years makes this AC adapter a reliable and efficient charging solution for your Lenovo laptop.