1、PCI-E 4-port RS232 serial port card. 2、Expand 4 independent 9-pin standard serial ports, like the built-in serial port data interface. 3、Designed for POS and ATM applications, and a smart choice for industrial automation system integrators 4、The four RS232 serial ports of the riser card can support communication speeds up to 250Kbps and provide modem control signals to ensure compatibility with various peripheral serial devices. 5、Stable and effective control of data loss. Support hot swap. Features: PCI-E 4-port RS232 serial port card. Expand 4 independent 9-pin standard serial ports, like the built-in serial port data interface. Designed for POS and ATM applications, and a smart choice for industrial automation system integrators. The four RS232 serial ports of the riser card can support communication speeds up to 250Kbps and provide modem control signals to ensure compatibility with various peripheral serial devices. Stable and effective control of data loss. Support hot swap. Support multiple systems: For Windows7/8/10/LINUX. Support a variety of mainstream operating systems. Specification: Type: Adapter Card Material: PCB System Requirements: For Windows7/8/10/LINUX Size: Approx. 12 * 9.5 * 2 cm / 4.72 * 3.74 * 0.78 in Weight: 98 g Package list: 1 * Converter Card 1 * Adapter Connector 1 * BaffleNote:  Please note that the old and new type of the product will be sent randomly, and make sure you will not mind before ordering.