Instantly Add Four USB 2.0 Ports to all Compatible Device. Easy Setup, Plug-and-Play, Hot Swappable, Hot Pluggable. Gain Four, Downstream Ports Which Offer High-Speed (480Mbps), Full-Speed (12Mbps), And Low-Speed (1.5Mbps). Intelligently Designed to Be as Thin as Possible, Allowing you to Maximize Precious Work Space or Travel with ease. Backwards Compatible With 1.1 Devices and Hosts.