Lenovo 4X90E51405 Compatible USB 3.0 Male to RJ 45 Female Black Adapter is a USB 3.0 to Gigabit Ethernet Adapter. It allows you to connect an RJ 45 ethernet cable to your system through any available USB 3.0 or USB 2.0 port, and offers a full gigabit connection. Additionally, it supports Wake on Lan and Green Ethernet, and is compatible with both Windows and Mac OS. br ul li Adapter to fit your application needs li li USB 3.0 A to RJ 45 for connectivity with ease li li Application and environment tested and guaranteed to work li ul