Get connected: expand your desktop to 2 monitors as mirrors or dedicate to separate apps using multi stream Transport (MST) Protocol | Certified Designed for Microsoft Surface Pro: designed to work with Microsoft Surface Pro 3 and Surface Pro 4. The spacing of ports on surface Pro 1/2 does not support the installation of this adapter | Self powered: powered by your existing computer device via the integrated USB cable. No external power supply required | Easy plug-and-play: No additional power adapters or drivers are necessary | Mac OS does not support the MST technology for expanded monitors. It will allow for mirroring