Welcome to our store! 1. Serial port expansion cards can automatically assign IRQ and I/O addresses, making them very practical. 2. No switches or jumpers are required, allowing for easy software settings, which is very convenient. 3. The product uses a 32-bit bus design, supporting the PCI 2.1 specification, making it very useful in your life. 4. The PCI to COM serial port expansion card uses a high-speed I/O controller (16C550C or compatible UART). 5. Supports Windows 95/98/98SE/2000/ME/NT4.0/XP/VISTA (32-bit and 64-bit)/WIN7 (32-bit and 64-bit)/Linux and DOS/OS and other systems. Item Type: Serial Port Expansion Card Material: PCB Color: Black card Transmission Type: PCI to COM 9-pin Transmission Speed: Up to 1 Mbytes/sec 32-bit bus design, supports PCI 2.1 specification Uses high-speed I/O controller (16C550C or compatible UART) Compatible System: For Windows95/98/98SE/2000/ME/NT4.0/XP/VISTA (32-bit and 64-bit)/WIN7 (32-bit and 64-bit)/Linux and DOS/OS, etc. 1 x Serial Port Expansion Card 1 x Driver CD Customers are our top priority. If you encounter any product issues after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.