Features: brand new and high quality PCI-E 4X 1 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. The slot only needs one cable, which is simple and convenient to install. Plug and for play, no need to install driver Specifications: Main control chip: ASM1812 Bus Speed: 20Gbps Bus port: PCI-E 4x Number of ports: 4 x USB 3.0 Supported operating systems: for DOS, for Linux, for Windows XP / 7 / 8 / 10 Product size: approx 120 x 62 x 18mm/4.7x2.4x0.7in Product weight: 35g Package size: 147x 125x 26mm/5.8x4.9x1in Package weight: 95g 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.