Features: PCIE to dual-port PS 2 Riser card, can add 2 independent PC boards or server hosts PS 2 port. PS/2 port: Provide 2 external independent PS/2 terminal interfaces, provide users with high speed, stable and safe data transmission. brand new and high quality MCS9990 chip, high performance, good stability and strong compatibility. PCI for Express bus:for PCI for Express x1, x4, x8, x16 card port on motherboard, PCI card port are not supported Stable transmission, for line strength, used for all other external PS/2 interface devices such as mouse, keyboard and so on. Supports hot-swappable, plug-and-play, and driverless peripherals. Specifications: Chip: MCS9990 Card slot: PCI for Express x1 Connectors: 2 x PS/2 (round terminals) Built-in 1 USB 2.0 expansion Size:approx 12x8.5cm/4.72x3.35in Operating system: for Windows, Linux, Kylin, UOS and MacOS platforms Package Includes: 1 x PCIE PS/2 Riser Card with Bezel note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment.