USB 3.0 HUB 3 0 HUB Multi USB Splitter 4/7 Port Expander Multiple USB 2.0 Hab Power Adapter USB3.0 Hub with Switch for PC Home

USB 3.0 HUB 3 0 HUB Multi USB Splitter 4/7 Port Expander Multiple USB 2.0 Hab Power Adapter USB3.0 Hub with Switch for PC Home     USB 3.0 HUB 2.0 HUB Multi USB Splitter 4/7 Port Expander Multiple USB 3 Hab Use Power Adapter USB3.0 Hub with Switch For PC (1)Do not used for charging , it is used for offering more usb ports to Transfer file (2)Thespecification of the power supply is 3.5*1.35mm5V 1A,  it support  less than 1TB hard disk , if your hard disk is  more than 1TB , then the power supply not suit you (3)There are 9 options in this link , if you want usb 3.0 with power apply , please choose the right option you need (4) 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   (5) The power supply  can improve the usb transmission speed, insufficient power supply will lead to reduced data transmission