The Lenovo 4X90S91830 is a wired USB-to-Ethernet adapter that provides reliable network connections for devices with USB ports. This compact adapter model converts a standard USB connection into a Gigabit Ethernet port and supports data transfer speeds of up to 1000 Mbps (1 Gbps). With a sturdy black housing in a matte finish, this adapter offers a practical solution for devices without built-in Ethernet capability, such as modern laptops, tablets, or desktop computers with limited expansion options. The adapter supports full-duplex operation and is compatible with IEEE 802.3, 802.3u, and 802.3ab standards, ensuring broad network compliance. Measuring approximately 6.5 cm in length, 2.5 cm in width, and 1.2 cm in height, and weighing around 25 g, this compact device is highly portable and suitable for travel or office use. The adapter does not require an external power source, as it draws power directly from the USB connection. It supports plug-and-play functionality on most operating systems, including Windows, macOS, and Linux, although specific driver installation may be required depending on the system configuration. The product includes a 1.5 m long Ethernet cable for immediate connectivity. This adapter is particularly useful in situations where wireless connectivity is unstable or unavailable, providing a stable wired alternative for tasks that require consistent network performance, such as video conferencing, large file transfers, or online gaming. Its robust construction and straightforward design make it a reliable accessory for both professional and personal computer environments. The successor to earlier USB-Ethernet adapter versions impresses with its reliability and practicality in various application scenarios.