Features: brand new and high quality The expansion card is super fast and high-capacity transfer solution, stable and reliable. Use safe and stable solid capacitors, reduce ESR, excellent conductivity, no sudden heat, and long service life. Thick gold-plated gold fingers are anti-oxidation, anti-corrosion, abrasion resistance and good stability. Ensure good contact, which can effectively reduce packet loss and increase data transmission rate. Work with most USB devices,such as smartphone,printers,tablet,hard disk ,etc. Supported system: Compatible for Linux / for Windows /for Mac OS10.8.2 and above systems. Specifications: Color: Black Material: Metal Mainboard Size: 120x70x100mm/4.72x2.76x3.94in Supported system: Compatible for Linux / for Mac/ for Windows /for Mac OS10.8.2 and above systems Package Includes: 1 x PCI-e to USB 3.0 Expansion Card note: Please allow 1-2cm error due to manual measurement. pls 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!