The Brainboxes 4 Port RS232 PCI Express Serial Card (PX - 420) is designed to enhance your PC's connectivity with four RS232 serial ports, including three external 9 - pin ports and one internal 9 - pin port. This plug - in card utilizes a PCI Express x1 interface, ensuring high - speed data transfer rates of up to 921, 600 baud. It is compatible with popular operating systems, including Windows 32 - bit and 64 - bit versions, making it a versatile choice for various applications. The card features a robust design with a depth of 4.3 inches and a height of 5 inches, and it is compliant with environmental standards such as RoHS and WEEE. With a lifetime warranty, this product guarantees long - lasting performance and reliability for your serial communication needs.