Belkin USB 3.0 Dual Video Docking Stand for Ultrabooks (2.1 Amp) Broad compatibility. Use with any USB 3.0-equipped Ultrabook or notebook Two external high-resolution displays take multitasking to another level Use across generations of laptops or with multiple laptops on a daily basis. Add 2 high-resolution monitors & multiple peripherals to a new laptop via a single USB 3.0 Port. USB 3.0 2.1A fast charging port charges phones & tablets FAST Use the laptop when the display is closed, in the vertical slot Security lock slot (cable lock sold separately) Please note that the Belkin USB 3.0 Dual Video Docking Stand for Ultrabooks is compatible with Mac OS X version 10.8.5. However, the newest version, Mac OS X 10.9 Mavericks, has known issues with the DisplayLink chip in the docking stand, making the stand incompatible with MacBook's that operate on Mavericks