Feature: 1. MULTI PORT DESIGN: PCIe RS232 serial adapter card has 2 x 9pin serial port and 1 x 25pin parallel port, which can meet the needs of users to connect multiple serial port devices and parallel port devices at the same time and improve work efficiency. 2. HIGH SPEED TRANSMISSION: PCIE RS232 serial host controller card adopts PCIe interface, with a bandwidth of 2.5Gbps, which can realize fast and stable data transmission and improve data transmission speed. 3. WIDE COMPATIBILITY: PCIE to RS232 and parallel port card are compatible with operating systems such as for Windows, for Linux and for DOS, and are suitable for different industrial control environments, providing more choices. 4. STABLE AND RELIABLE: PCIe combo serial parallel expansion card is made of PCB material, which has high stability and reliability after strict testing and quality control, and can run stably for a long time. 5. EASY INSTALLATION: PCI express RS232 serial adapter card adopts PCIE interface, which is easy to install and plug in, and users can install and use it by themselves. Specification: Item Type: Computer Serial and Parallel Port Combination Card Material: PCB Interface Type: PCIEx1 to RS232 2x9pin Serial Port, 25pin Parallel Port PCIE Bandwidth: 2.5Gbps Compatible Systems: for Windows, for Linux, for DOS. Package List: 1 x Expansion Card