Features: brand new and high quality Super fast and high capacity transfer solution, stable and reliable. Fully compliant with PCI for Express Base Specification Revision 2.0. Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devices. Supports 4 downstream ports for all speeds. Built-in 4-pin power connector for receiving additional power from the system. Supports for Windows 7 (32-bit/64-bit), for Windows Vista (32-bit/64-bit), for Windows XP. Specifications: Type Name: 1 to 4 PCI-E USB3.0 Adapter Card Color :black Material: Metal + Plastic Bus: PCI-E Port Quantity: 4 x USB 3.0 Size: approx. 12x8x6.7cm/4.72x3.15x2.64in Note: Due to the original production of for raw materials shortage and production batches are different, the card slot and cable color will have some differences, but the card is the same function, please rest assured that it will not affect the normal use, hope to understand. (colors are sent randomly!) There may be little error of size for manual measurement. The color deviation may be different due to different monitor settings, please understand. Package includes: 1PC x 1 to 4 PCI-E Adapter Card