Winten WT-U3H04A-BK 4 Port 3.0 USB Hub , 5V/4A 20W AC Power Adapter SuperSpeed Hub with 20W Power Adapter ,Maximum transfer speed of 5 GB per second Latest VIA VL812 Chipset Adopted, 3.3 feet USB 3.0 Cable , Backward Compatible with USB 2.0 and Supporting Windows / Mac / Linux OS 1 x input port with 4 x output port 3.0 usb high speed hub Data transfer speed up to 5 Gbps Power supply 5V, 4A (AC adapter) for stable large data transfer Window XP / Vista / 7 / 8 USB-aware Mac system