Dual HD Display: Extend your laptop with 2 extra monitors either in mirrors or extended mode using Multi-Stream Transport (MST) Protocol Certified Designed for Microsoft Surface Pro: Compatible 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: Connect with the integrated USB-A cable to power the MST hub and the mini DisplayPort for video. 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