The PCIe M.2 A+E RTL8125B is a compact single-port 2.5 Gigabit Ethernet card designed for systems with M.2 A+E key slots, such as ultrabooks, embedded platforms, and small form factor PCs. Powered by the Realtek RTL8125B chipset, it delivers high-speed, stable, and energy-efficient wired networking in a space-saving design.