Features: Chassis expansion card from 19pin to USB3.0 accelerates the upgrade of the new formula, easy installation of high speed and stability. Accelerate the upgrade of the new formula USB3.0 high-speed transmission, enjoy the world quickly, improve transmission speed (must be powered to use). Two-port expansion for playing external devices, keyboards, mice, printers, cooling fans, and other external devices. No matter how many, you can play simultaneously without connection issues. The gold-plated thickened connector has good oxidation resistance, corrosion resistance, wear resistance, and stability. Ensuring good contact can effectively reduce packet loss and improve data transfer speed. Solid state capacitor adopts safe and stable solid state capacitor to reduce ESR, with excellent conductivity, no sudden heating, and long service life. The large 4-pin port is fully powered, and the four ports are fully charged, so the expansion interfaces do not affect each other and can meet the USB3.0 power supply standard. Multi-system compatibility: Powerful compatibility, not only for Windows, Vista, Linux, and other systems, but also for MacOS 10.8.2 and higher, realizing the recreation of Apple's trash can and other devices. Specifications: Material: Metal Color: Black Size: Approx. 120x73x72mm /4.72x2.87x2.83in Note: Please allow 0-1cm error due to manual measurement. Please make sure you don't mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PC x PCI-E Expansion Card