What's in the box:

PCI-E USB3.0 Express Card 4 Ports External Dual 19/20Pin Front Connector Expansion Card (Standard)

This item is a dual-port expansion card consisting of an internal USB3.0 19Pin connector.USB3.0 Housing 19Pin can be expanded to the front panel of the computer case.

Features:
Support 5Gbps high speed data transfer. USB3.0 ensures faster transfer rate.
Support USB 3.0 Super-Speed(5Gbps) and High-Speed(480Mbps) and Full-Speed(12Mbps).
Downward compatible with USB2.0/1.1.Support hot-plug.
Built-in 19Pin dual ports. Do not need power supply.
Driver CD and low profile bracket are included in the package.

Specification:
Item size: 12 * 9 * 2cm / 4.72 * 3.54 * 0.79in(L * W * H)
Item weight: Approx.52g / 1.83oz
Package size: 12 * 9 * 2cm / 4.72 * 3.54 * 0.79in(L * W * H)
Package weight: 74g / 2.61oz

Package list:
1 * Expansion card
1 * Low profile bracket
1 * Driver CD