SIIG JU-H30F11-S1 is a Mini DisplayPort 4K Video Dock with USB 3.0 LAN Hub that allows you to connect multiple devices to your laptop or computer. It supports HDMI or DisplayPort output with resolutions up to 4K@60Hz, and two USB 3.0 ports for data transfer and charging. The Gigabit Ethernet port provides a stable and fast internet connection. The device is compatible with Windows 10/8.1/8/7 (32/64 bit) and Mac OS X 10.9 to 10.15. With its compact size and wide compatibility, the SIIG JU-H30F11-S1 is a versatile and portable solution for expanding the capabilities of your laptop or computer.