USB 3.0 Hub USB Hub 3.0 Multi USB Splitter 3 Hab Use Power Adapter 4/7 Port Multiple Expander 2.0 USB3 Hub with Switch for PC(1)DO not used for charging,it is used for offering more usb ports to transfer file.(2) The power supply can solve the problem of insufficient power supply, if you need work with a hard disk , then you should choose the with power supply , and please note ,please don't use more than 2 hard disk at the same time(3) The power supply can improve the usb transmission speed1. 100% brand new and high quality2.Hot plug & play USB device3. Fully compatible with USB specification version 3.04.With blue LED for power5. ON/OFF switches activate or deactivate individual ports6.Designed with 4-port,7-port,this compact USB3.0 high-speed hub is small enough for travel,and cable enough to meet your connectivity needs7.Thespecification of the power supply is 3.5*1.35mm, 5V 2A.Item Name:USB HUB 3.0 / 2.0USB Ports:4,7Cable:USB 3.0 About 605mm,USB 2.0About 400mmSize:104*35*21mm,164*35*21mmData Transfer Rate:Upto 5Gbps/480mbpsColor:Black/WhiteCompatible: WindowsXP/Vista/7 and MAC OS 9.1 or higher
