(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

1. 100% brand new and high quality

2. Hot plug & play USB device

3. Fully compatible with USB specification version 3.0/2.0

4. With blue LED for power

5. ON/OFF switches activate or deactivate individual ports

6. Designed with 4-port,7-port,this compact USB 3.0/2.0 high-speed hub is small enough for travel,and cable enough to meet your connectivity needs