thank you for understanding!
(1)Do not used for charging , it is used for offering more usb ports to Transfer file
(2)The specification of the power supply is 3.5*1.35mm 5V 1A, it support less than 1TB hard disk , if your hard disk is more than 1TB , then the power supply not suit you
(3) 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
(4) The power supply can improve the usb transmission speed, insufficient power supply will lead to reduced data transmission, error code, with power can improve reliability.
1. 100% brand new and high quality
2. Hot plug & play USB device
3. Fully compatible with USB specification version 2.0
4. With blue LED for power
5. ON/OFF switches activate or deactivate individual ports
6. Designed with 4-port,this compact USB 2.0 high-speed hub is small enough for travel,and cable enough to meet your connectivity needs
Item Name:USB HUB 2.0
Cable: is About 600mm
Date Transfer Rate:480 Mbps
Compatible: WindowsXP/Vista/7 and MAC OS 9.1 or higher