The Cables to Go Trulink 39950 Gigabit Ethernet Adapter is a cost effective solution for converting an existing USB port to a 10 100 1000 Base T Ethernet port without replacing or adding a new network card. With this adapter users can create a new network connection that allows them to connect to another network or computer without the need for a router or switch. The Auto Sensing feature detects the correct connection speed whether 10, 100 or 1000 Base T.