7 Port USB 3.0 Port will transfer rates up to 5Gbps (500MBps) to allow data to move quickly between devices. with 2 Smart Charging Port, it can charge your phone iPad Tablet even if the computer is off.
7 USB 3.0 ports for data transfer
1 Charging port for charging phone/tablet etc.
LED: 7 built-in blue LEDs
Switcher: 7 ON/OFF power button
Cable length: 100 cm / 39 inches
System Supports: Windows 10.1/ 10/ 8.1/ 8/ 7/ Vista/ XP/ 2000 and Mac OS X 10.2 or above / Linux 9 or above
USB Port Supports: backwards compatibility with USB 2.0/1.x version
USB 3.0 data transfer rates: Up to 5 Gbps (ten times faster than USB 2.0)
Why need a 5V 4A power adapter
USB3.0 port on laptop/desktop provides only 900mAh of current, it's really not enough if you have multi usb devices.
Some devices require more power such as external hard drive, one external hard drive requires 0.5A to 1A of current, you can't plug other devices in if only 900mAh
with the power adapter, you can charge the phones/tablets (iphone requires 1A, Samsung require 2.1A)