Features: brand new and high quality The main board is directly connected, fast and stable, solid capacitors are safe and stable, lower ESR, excellent conductivity, no sudden heat, and long service life. Dual-chip, dual-inductance, filtering and stable current, dual insurance, internal and external, dual care, making the current stable and safe input interface. The 19PIN port is reserved for expansion, the large 4PIN port provides power supply, and the 5 ports are fully loaded and run freely. With 5 port expansion, millions of plug-in experiments, the interface is still responsive and does not for pop up. There are many external devices such as keyboards, mice, printers, cooling fans, disk arrays, etc., which can also be easily played with. The USB3.0 standards match each other, and the speed does not slow down. Specifications: Material:Metal Size:Approx.8.2x12cm/3.23x4.72inches Color:Black Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Expansion Card