This expansion card can adapt the standard PCI-E interface to a 2-port USB3.0 interface, fast transmission speed, and dual USB3.0 interfaces can meet your transmission needs. Dual USB 3.0 Interfaces Meet your transmission needs. Uses high-quality electronic components, Low impedance, high stability, high temperature resistance. Uses high-quality VL805 chip. Large 4P power supply, stable power supply, ensures transmission safety. Specifications: Compatible Slots: PCI-E x1 / x4 / x8 / x16 (not compatible with PCI slot) Chip Used: VL805 OS: Windows XP / Windows 7 / Windows8 / Windows8.1 / Windows10 / Vista Item Weight: 40g / 1.41oz Package Weight: 40g / 1.41oz Item Size: 6.7 * 6.5 * 0.4cm / 2.64 * 2.56 * 0.16inL * W * H Package Size: 6.7 * 6.5 * 0.4cm / 2.64 * 2.56 * 0.16inL * W * H Package List: 1 * PCI-E to USB 3.0 Expansion Card 1 * CD Drive