The PCIe x1 RTL8111H Quad 1G RJ45 network card is a compact and efficient multi-port Gigabit Ethernet adapter designed for firewalls, routers, and embedded systems. Featuring four independent Realtek RTL8111H controllers, it delivers four 1 Gigabit RJ45 ports through a single PCIe x1 interface, making it ideal for multi-network environments where space and power efficiency are critical.