The Mainpine IQ Express 2-Port PCIe Fax Modem Card RF5120 is a plug-in card designed for computers with PCI Express x1 compatibility. This fax modem card features two ports and a maximum data rate of 33.6 Kbps, making it suitable for high-speed fax transmission. With its universal compatibility and external interfaces for DSL/Phone (RJ-11), this modem card provides a reliable and efficient solution for communication needs. Perfect for businesses or individuals looking to add fax capabilities to their computer system.