Review on 🌟 High-Quality StarTech.com Mini DisplayPort to HDMI Adapter for 4K 60Hz Video - Active mDP 1.4 to HDMI 2.0 Converter - Compatible with Mini DP or Thunderbolt 1/2 Mac/PC - Ideal for HDMI Monitor/TV/Display - mDP to HDMI Dongle (MDP2HD4K60S) by Stacy Sanders

I have a 34 inch 3440 x 1440 widescreen display and a Surface Pro 6 (and dock). All other MiniDisplayPort adapters limited my resolution to 1080p. Tip for Surface Pro users: I had to take extra steps to get the correct resolution. First I had to connect directly to my surface and then go to the dock. I also had to return my graphics card adapter. I suspect that last part is because I used to use a DisplayPort adapter.