Features:
Extend with 2 USB 3.0 downstream ports and 1 USB3.0 19-pin connector(can expand another two USB 3.0 ports) for standard desktop PC.
SuperSpeed USB 3.0 is fully compatible with original USB system, peripherals and cables.
Fully compliant with one-lane (x1) PCI Express 2.0 specification.
TWO external 5Gbps SuperSpeed USB 3.0 ports.
One 19-pin internal 5Gbps SuperSpeed USB 3.0 port.
Built-in with 4-pin IDE Power Connector for added power source to better support power hungry bus-powered devices.
SuperSpeed USB 3.0 offers 10 times performance increase over Hi-Speed USB 2.0.
USB 3.0 complies with Intel eXtensible Host Controller Interface (xHCI).
Up to 5Gbps maximum transfer rate.
SuperSpeed USB 3.0 is backwards compatible with USB 1.0/1.1/2.0 devices (data transfer rate at 1.5/12/480Mbps).
Supports PCI Low profile.
Ideal connection for digital cameras, scanners, printers, external CD/DVD/Blu-Ray writers, hard disk drives, flash memory drives and etc.
Fully Plug-N-Play and Hot Swap compatible.

System Requirements:
PC with 512MB of RAM and 1.0GHz or faster processor.
1 available PCI Express 1.x or 2.x slot.
System Support: Windows XP / Vista / Windows7 (32/64 bit)/Windows8 (32/64 bit).

Note:
To achieve the maximum throughput, the PCI-Express slot must be version 2.0 or higher. Performance per port may decrease if multiple ports are transferring data simultaneously due to limited throughput of the PCI-Express slot.
To meet USB 3.0 transfer speed, high quality USB 3.0 cables and devices are required.
Supports both 32-bit & 64-bit OSes.
Make sure the power is well connected; otherwise you will see a "Power Surge on Hub Port" message error and no 5V bus power in USB ports.

Specifications:
Certifications: CE, FCC, RoHS
Item size: 12 * 8cm / 4.7 * 3.1in
Item weight: 48g / 1.7oz
Package size: 15 * 13 * 3cm / 5.9 * 5.1 * 1.2in
Package weight: 115g / 4.1oz

Package list:
1 * PCI Express Card
1 * Low Profile Bracket
2 * Screws
1 * Software Drivers CD
1 * User Manual