Features: brand new and high quality PCI-E 1X to 4 USB 3.0 port riser for btc mining miner multiplier expansion card desktop computer extender Four slots provide great scalability. The plug is directly inserted on the board and can be fixed on the chassis without any extension cable. PCI-E slot power solution without additional power cord. Plug and for play, simple and convenient to install.no need to install driver Specifications: Main control chip:VIA805 Speed: 5Gbps Bus port: PCI-E 1X Number of ports: 4 x USB 3.0 for : PCIE 1X 4X 8X 16X slots Supported operating systems: for windows/ Linux etc systems Package size approx：16x13x3cm/6.3x5.11x1.18in Product weight: 70g : Package Includes: 1 x PCI for Express To 4-Port USB3.0 Expansion Card note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 for cm differences due to manual measurement.