(2)The specification of the power supply is 3.5*1.35mm 5V 1A
(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, error code, with power can improve reliability.
Item Name:USB HUB 3.0/2.0
USB Ports:4 , 7
Cable: USB 2.0 HUB is About 400mm
Date Transfer Rate:Upto 5Gbps
Compatible: WindowsXP/Vista/7 and MAC OS 9.1 or higher
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