Feature: 1. Fast transmission speed. USB 3.0 transmission rate can up to 5Gbps. 2. Dual USB 3.0 interface satisfy your transmission needs. 3. Adopted high-quality electronic components, low impedance, high stability, high temperature resistance. 4. Adopted high-quality VL805 chip. 5. Large 4P power supply, stable power supply, guarantee transmission security. Specification: This expansion card can adapt standard PCI-E interface into 2 port USB3.0 interface, fast transmission speed and dual USB3.0 interface can satisfy your transmission needs. Features: Fast transmission speed. USB 3.0 transmission rate can up to 5Gbps. Dual USB 3.0 interface satisfy your transmission needs. Adopted high-quality electronic components, low impedance, high stability, high-temperature resistance. Adopted high-quality VL805 chip. Large 4P power supply, stable power supply, guarantee transmission security. Specifications: Compatible Slots: PCI-E x1 / x4 / x8 / x16 (not compatible for PCI slot) Using Chip: 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 * 0.16in（L * W * H） Package Size: 6.7 * 6.5 * 0.4cm / 2.64 * 2.56 * 0.16in（L * W * H） Package List: 1 * PCI-E to USB 3.0 Expansion Card 1 * CD Drive Package List: 1 * PCI-E to USB 3.0 Expansion Card 1 * CD Drive