USB Hub 3.0 USB 3 0 Hub Multi USB Splitter 3 Hab Use Power Adapter Multiple Expander 3.0 Hub With Switch for Laptop Acceorie Notice (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 donand x27 t use more than 2 hard disk at the same time (3) The power supply can improve the usb transmiion speed Features 1. 100 percent brand new and high quality 2.Hot plug andamp play USB device 3. Fully compatible with USB specification version 3.0 4.With blue LED for power 5. ON or OFF switches activate or deactivate individual ports 6.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 needs 7.The specification of the power supply is 3.5x1.35mm, 5V 2A. Description Item Name:USB HUB 3.0 or 2.0 USB Ports:4,7 Cable:USB 3.0 About 605mm,USB 2.0About 400mm Size:104x35x21mm,164x35x21mm Data Transfer Rate:Up to 5Gbps or 480mbps Color:Black or White Compatible: WindowsXP or Vista or 7 and MAC OS 9.1 or higher Package Including 1xUSB3.0 HUB