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Works as expected for remote desktop/screen sharing purposes, without the need to keep a display connected to the remote computer. Using this on an Apple Mac Mini its display options are the same as with a connected display, up to 1080P (might be a function of my ~2011 era computer). Screen sharing is as fluid as with a display connected. While the plug's black plastic design not as aesthetically attractive as some of the other equivalents dummy plugs available here, you get a three-pack for about the same price as one of those other ones. I really only needed one and would have preferred that option if available.
*Wouldn't do 4K* I have a small PC deployed at a client's site that I use for remote system service. The PC is running windows 10 and is mounted in an equipment rack where there is no room for a monitor, nor is there a need for one, because I'm not there to even look at it. When accessing the PC with VNC or TeamViewer, I was getting a black screen, possibly because of how windows manages GPU video memory when there is no actual output. This device fools the PC into thinking there is a monitor, thus allocating video memory, producing simulated output, and providing my remote sessions with a usable desktop image at 1920x1080. The resolution options did not go higher than that, but it was all I needed anyway. Per the spec on my AMD Radeon Vega 8 GPU, I should be able to output UHD and true 4K, but these were not available. Dinged one star because of the lack of 4K.