- This device adds 3 USB 3.0 ports and a Gigabit Ethernet port to Ultrabooks, notebooks and tablets with limited USB ports or slower 10/100 Mbps networking. - Expands a USB 3.0 port into 3 USB 3.0 ports and is backward compatible with all USB 2.0 / USB 1.0 devices. - Enjoy USB 3.0 transfer speeds up to 5 Gbps. - A cost-effective solution for upgrading a computer with a 1000 Mbps Gigabit Ethernet port. - Doubles as a USB 3.0 to 1000 Mbps network port adapter, great for computers with no wired Ethernet port. - Fully plug and play with no driver installation needed. - Supports IPv4/IPv6 protocols, dual channel transfer mode, automatic transfer and data stream reversing regulation. - Applications: use with ultrabooks or tablets that need more USB ports and a wired network; upgrade a laptop without a built-in Ethernet port to Gigabit Ethernet; add wired networking to a desktop or PC with limited USB ports.