What's in the box:

PCI-E Adapter Card PCI-E X1 to PCI-E X16 Expansion Card Converter Card with USB3.0 Cable Power Cable Plug and Play (Standard)

Features:
USB3.0 interface provides up to 5Gbps transmission speed.
Simultaneously support 4 PCI-E X16 cards, non-interference.
Compliant with PCI-E 2.0&1.1 specification.
Easy installation, plug and play, convenient and efficient.
Goldfinger design, good electrical conductivity, strong oxidation resistance ability.

Specification:
Model:LPE-51X
Color: Blue
Data transfer speed: 5Gbps(theoretical)
Onboard interface: 1*USB3.0 Type-A, 4*4Pin power port, 4*4 PCI-E X16 slot
System requirement: Windows/Linux/Mac
Expander board size: 12 * 6.6 * 2.1cm /4.72 * 2.6 * 0.83in
PCI-E card size: 17.6 * 15 * 1.9cm /6.93 * 5.91 * 0.75in

Packing list:
1 * PCI-E card
1 * PCI-E slot board
1 * USB3.0 cable
2 * Power cable