Material: Metal Color: as shown in the picture Size: 12cm x 5.5cm x 7.5cm Chip: ASM1184E Support System: Compatible with Windows, Linux, MAC systems Bus Interface: PCI-E X1 (compatible with X4, X8, X16 graphics card interfaces) Number of interfaces: 4 PCI-E USB interfaces Effectively solves insufficient motherboard PCI-E interfaces by extending 1 interface to 4. Plug-in board design, directly connects to motherboard interface without extension cable, and can be fixed to the chassis, greatly improving stability and reliability. Main control board adopts PCI-E interface direct power supply mode, no external power line needed, reducing external interference for higher stability. Reduces adapters and patch cords, ensuring data reliability and improving work efficiency. USB connector is gold-plated to reduce interface interference and enhance data integrity, with 6 LEDs flashing when powered on. Added BIOS enhances compatibility with motherboards and graphics cards, reducing power consumption. Package Contents: 1 x PCI-E 1 to 4 riser card