Sabrent 4 Port USB 3.0 Hub with Power Adapter for Ultra Book, MacBook Air, Windows 8 Tablet PC - Black (HB-CHST) 4 SuperSpeed USB 3.0 ports support data transfer rates of up to 5Gbps. (Note: actual rate will depend on the capability of your device.) Backward compatible with USB 2.0 / 1.1. Supports Plug and Play and hot swapping. No installation of drivers required for Windows XP / Vista / 7 / 8 or Mac OS X 10.2 and above. Safe and reliable. Voltage and Current overload protection(surge protector) protect the Hub and conneted devices from electronically accident