Features: Brand new and high quality. This 19-pin to USB3.0 chassis expansion card accelerates the upgrade of your system with easy installation, high speed, and stability. Enjoy fast USB3.0 high-speed transmission and improved transfer rates (requires power for use). Two-port expansion for connecting external devices like keyboards, mice, printers, cooling fans, and more. Connect multiple devices simultaneously without connection issues. The gold-plated thickened finger offers excellent oxidation resistance, corrosion resistance, wear resistance, and stability. This ensures good contact, effectively reducing packet loss and improving data transfer speed. Solid-state capacitors provide safe and stable performance, reducing ESR with excellent conductivity, no sudden heating, and a long lifespan. The large 4-pin port is fully powered, ensuring all four expansion interfaces are fully charged and do not affect each other, meeting USB3.0 power supply requirements. Multi-system compatibility: Powerful compatibility not only for Windows, Vista, Linux, and other systems, but also for MacOS 10.8.2 and higher, enabling the recreation of Apple's "trash can" and other devices. Specifications: Material: Metal Color: Black Size: approx. 120x73x72 mm/4.72x2.87x2.83 inches Note: Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1pc x PCI-E Expansion Card